402804923 has 2 divisors, whose sum is σ = 402804924. Its totient is φ = 402804922.

The previous prime is 402804863. The next prime is 402804931. The reversal of 402804923 is 329408204.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 402804923 - 2⁸ = 402804667 is a prime.

It is equal to p_21477731 and since 402804923 and 21477731 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 402804923.

It is not a weakly prime, because it can be changed into another prime (402804943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201402461 + 201402462.

It is an arithmetic number, because the mean of its divisors is an integer number (201402462).

Almost surely, 2^402804923 is an apocalyptic number.

402804923 is a deficient number, since it is larger than the sum of its proper divisors (1).

402804923 is an equidigital number, since it uses as much as digits as its factorization.

402804923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 402804923 is about 20070.0005729945. Note that the first 3 decimals coincide. The cubic root of 402804923 is about 738.5245271655.

The spelling of 402804923 in words is "four hundred two million, eight hundred four thousand, nine hundred twenty-three".