556400639 has 2 divisors, whose sum is σ = 556400640. Its totient is φ = 556400638.

The previous prime is 556400597. The next prime is 556400653. The reversal of 556400639 is 936004655.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 556400639 - 2¹² = 556396543 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556400539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278200319 + 278200320.

It is an arithmetic number, because the mean of its divisors is an integer number (278200320).

Almost surely, 2^556400639 is an apocalyptic number.

556400639 is a deficient number, since it is larger than the sum of its proper divisors (1).

556400639 is an equidigital number, since it uses as much as digits as its factorization.

556400639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 97200, while the sum is 38.

The square root of 556400639 is about 23588.1461543717. The cubic root of 556400639 is about 822.4873112666.

The spelling of 556400639 in words is "five hundred fifty-six million, four hundred thousand, six hundred thirty-nine".