409625857 has 2 divisors, whose sum is σ = 409625858. Its totient is φ = 409625856.

The previous prime is 409625831. The next prime is 409625891. The reversal of 409625857 is 758526904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402845041 + 6780816 = 20071^2 + 2604^2 .

It is a cyclic number.

It is not a de Polignac number, because 409625857 - 2⁷ = 409625729 is a prime.

It is not a weakly prime, because it can be changed into another prime (409620857) 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, 204812928 + 204812929.

It is an arithmetic number, because the mean of its divisors is an integer number (204812929).

Almost surely, 2^409625857 is an apocalyptic number.

It is an amenable number.

409625857 is a deficient number, since it is larger than the sum of its proper divisors (1).

409625857 is an equidigital number, since it uses as much as digits as its factorization.

409625857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 409625857 is about 20239.2158197891. The cubic root of 409625857 is about 742.6698403360.

The spelling of 409625857 in words is "four hundred nine million, six hundred twenty-five thousand, eight hundred fifty-seven".