390256 has 10 divisors (see below), whose sum is σ = 756152. Its totient is φ = 195120.

The previous prime is 390223. The next prime is 390263. The reversal of 390256 is 652093.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 390256.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12180 + ... + 12211.

2³⁹⁰²⁵⁶ is an apocalyptic number.

It is an amenable number.

390256 is a deficient number, since it is larger than the sum of its proper divisors (365896).

390256 is a wasteful number, since it uses less digits than its factorization.

390256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24399 (or 24393 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 390256 is about 624.7047302526. The cubic root of 390256 is about 73.0774183360.

Adding to 390256 its product of nonzero digits (1620), we get a square (391876 = 626²).

It can be divided in two parts, 390 and 256, that added together give a palindrome (646).

The spelling of 390256 in words is "three hundred ninety thousand, two hundred fifty-six".