402979979 has 2 divisors, whose sum is σ = 402979980. Its totient is φ = 402979978.

The previous prime is 402979963. The next prime is 402979991. The reversal of 402979979 is 979979204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402979979 - 2⁴ = 402979963 is a prime.

It is not a weakly prime, because it can be changed into another prime (402979919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201489989 + 201489990.

It is an arithmetic number, because the mean of its divisors is an integer number (201489990).

Almost surely, 2^402979979 is an apocalyptic number.

402979979 is a deficient number, since it is larger than the sum of its proper divisors (1).

402979979 is an equidigital number, since it uses as much as digits as its factorization.

402979979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2571912, while the sum is 56.

The square root of 402979979 is about 20074.3612351676. The cubic root of 402979979 is about 738.6314974120.

The spelling of 402979979 in words is "four hundred two million, nine hundred seventy-nine thousand, nine hundred seventy-nine".