390538257 has 4 divisors (see below), whose sum is σ = 520717680. Its totient is φ = 260358836.

The previous prime is 390538249. The next prime is 390538259. The reversal of 390538257 is 752835093.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 390538257 - 2³ = 390538249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (390538259) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65089707 + ... + 65089712.

It is an arithmetic number, because the mean of its divisors is an integer number (130179420).

Almost surely, 2^390538257 is an apocalyptic number.

It is an amenable number.

390538257 is a deficient number, since it is larger than the sum of its proper divisors (130179423).

390538257 is a wasteful number, since it uses less digits than its factorization.

390538257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130179422.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 390538257 is about 19762.0408106046. The cubic root of 390538257 is about 730.9503210924.

The spelling of 390538257 in words is "three hundred ninety million, five hundred thirty-eight thousand, two hundred fifty-seven".