400624979 has 2 divisors, whose sum is σ = 400624980. Its totient is φ = 400624978.

The previous prime is 400624969. The next prime is 400624993. The reversal of 400624979 is 979426004.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400624979 - 2⁴ = 400624963 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (400624969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200312489 + 200312490.

It is an arithmetic number, because the mean of its divisors is an integer number (200312490).

Almost surely, 2^400624979 is an apocalyptic number.

400624979 is a deficient number, since it is larger than the sum of its proper divisors (1).

400624979 is an equidigital number, since it uses as much as digits as its factorization.

400624979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 400624979 is about 20015.6183766578. The cubic root of 400624979 is about 737.1898404303.

The spelling of 400624979 in words is "four hundred million, six hundred twenty-four thousand, nine hundred seventy-nine".