401772979 has 2 divisors, whose sum is σ = 401772980. Its totient is φ = 401772978.

The previous prime is 401772977. The next prime is 401773033. The reversal of 401772979 is 979277104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 401772979 - 2¹ = 401772977 is a prime.

It is a super-2 number, since 2×401772979² = 322843053309068882, which contains 22 as substring.

Together with 401772977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (401772971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200886489 + 200886490.

It is an arithmetic number, because the mean of its divisors is an integer number (200886490).

Almost surely, 2^401772979 is an apocalyptic number.

401772979 is a deficient number, since it is larger than the sum of its proper divisors (1).

401772979 is an equidigital number, since it uses as much as digits as its factorization.

401772979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 222264, while the sum is 46.

The square root of 401772979 is about 20044.2754670754. The cubic root of 401772979 is about 737.8933136762.

The spelling of 401772979 in words is "four hundred one million, seven hundred seventy-two thousand, nine hundred seventy-nine".