400030979 has 2 divisors, whose sum is σ = 400030980. Its totient is φ = 400030978.

The previous prime is 400030963. The next prime is 400030987. The reversal of 400030979 is 979030004.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 400030979 - 2⁴ = 400030963 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (400030919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200015489 + 200015490.

It is an arithmetic number, because the mean of its divisors is an integer number (200015490).

Almost surely, 2^400030979 is an apocalyptic number.

400030979 is a deficient number, since it is larger than the sum of its proper divisors (1).

400030979 is an equidigital number, since it uses as much as digits as its factorization.

400030979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 32.

The square root of 400030979 is about 20000.7744600053. The cubic root of 400030979 is about 736.8253205057.

The spelling of 400030979 in words is "four hundred million, thirty thousand, nine hundred seventy-nine".