1420
1,420 MHz is the frequency of the hydrogen line, and the frequency SETI listens on.
- Even
- Composite
Why 1420 is special
Hydrogen is the most abundant element in the universe and emits at this frequency, so any technological civilisation studying the sky would know it. That shared reference is the argument for listening there, and the same frequency is used to map the structure of our own galaxy.
Factors & digit properties
- Divisors (12)
- 1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420
- Prime factorisation
- 2^2 × 5 × 71
- Digit sum
- 7
- Digital root
- 7
Representations
- Decimal
- 1420
- Binary
- 10110001100
- Octal
- 2614
- Hexadecimal
- 58c
- Roman numeral
- MCDXX
- Scientific notation
- 1.420 × 10^3
Other mathematical patterns
- Abundant number
Science
Hydrogen is the most abundant element in the universe and emits at 1,420 MHz, so any civilisation studying the sky would find it. That shared reference is the argument for listening there for signals, and the same line is used to map the structure of our own galaxy.
DocumentedScience
Common questions
Is 1420 a prime number?
No, 1420 is not prime.
What are the factors of 1420?
The factors of 1420 are 1, 2, 4, 5, 10, 20, 71, 142, 284, 355, 710, 1420.
What is 1420 in Roman numerals?
1420 in Roman numerals is MCDXX.
About this page's data
Mathematical facts:computed directly from the number's value — nothing to source or verify externally.
Contextual records: 1 reviewer-confirmed record, sourced and reviewed before publication.
Last reviewed: 3 August 2026