408664257 has 8 divisors (see below), whose sum is σ = 546259776. Its totient is φ = 271755792.

The previous prime is 408664219. The next prime is 408664271. The reversal of 408664257 is 752466804.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-408664257 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (408664357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170373 + ... + 172754.

It is an arithmetic number, because the mean of its divisors is an integer number (68282472).

Almost surely, 2^408664257 is an apocalyptic number.

It is an amenable number.

408664257 is a deficient number, since it is larger than the sum of its proper divisors (137595519).

408664257 is a wasteful number, since it uses less digits than its factorization.

408664257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343527.

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 408664257 is about 20215.4460005215. The cubic root of 408664257 is about 742.0882438527.

The spelling of 408664257 in words is "four hundred eight million, six hundred sixty-four thousand, two hundred fifty-seven".