393699257 has 12 divisors (see below), whose sum is σ = 470359680. Its totient is φ = 322781448.

The previous prime is 393699253. The next prime is 393699259. The reversal of 393699257 is 752996393.

It is not a de Polignac number, because 393699257 - 2² = 393699253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 393699199 and 393699208.

It is not an unprimeable number, because it can be changed into a prime (393699253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49457 + ... + 56862.

It is an arithmetic number, because the mean of its divisors is an integer number (39196640).

Almost surely, 2^393699257 is an apocalyptic number.

It is an amenable number.

393699257 is a deficient number, since it is larger than the sum of its proper divisors (76660423).

393699257 is a wasteful number, since it uses less digits than its factorization.

393699257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106372 (or 106349 counting only the distinct ones).

The product of its digits is 2755620, while the sum is 53.

The square root of 393699257 is about 19841.8561883711. The cubic root of 393699257 is about 732.9171177862.

The spelling of 393699257 in words is "three hundred ninety-three million, six hundred ninety-nine thousand, two hundred fifty-seven".