11420639 has 2 divisors, whose sum is σ = 11420640. Its totient is φ = 11420638.

The previous prime is 11420623. The next prime is 11420641. The reversal of 11420639 is 93602411.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11420639 - 2⁴ = 11420623 is a prime.

It is a Sophie Germain prime.

Together with 11420641, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₇₅₂₄₀₈ and since 11420639 and 752408 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11420699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5710319 + 5710320.

It is an arithmetic number, because the mean of its divisors is an integer number (5710320).

Almost surely, 2^11420639 is an apocalyptic number.

11420639 is a deficient number, since it is larger than the sum of its proper divisors (1).

11420639 is an equidigital number, since it uses as much as digits as its factorization.

11420639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 11420639 is about 3379.4435932561. The cubic root of 11420639 is about 225.1974497217.

The spelling of 11420639 in words is "eleven million, four hundred twenty thousand, six hundred thirty-nine".