404990857 has 2 divisors, whose sum is σ = 404990858. Its totient is φ = 404990856.

The previous prime is 404990843. The next prime is 404990879. The reversal of 404990857 is 758099404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 345067776 + 59923081 = 18576^2 + 7741^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-404990857 is a prime.

It is not a weakly prime, because it can be changed into another prime (404990557) 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, 202495428 + 202495429.

It is an arithmetic number, because the mean of its divisors is an integer number (202495429).

Almost surely, 2^404990857 is an apocalyptic number.

It is an amenable number.

404990857 is a deficient number, since it is larger than the sum of its proper divisors (1).

404990857 is an equidigital number, since it uses as much as digits as its factorization.

404990857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 404990857 is about 20124.3846365547. The cubic root of 404990857 is about 739.8580547074.

The spelling of 404990857 in words is "four hundred four million, nine hundred ninety thousand, eight hundred fifty-seven".