399256 has 32 divisors (see below), whose sum is σ = 882000. Its totient is φ = 167040.

The previous prime is 399241. The next prime is 399263. The reversal of 399256 is 652993.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

399256 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970 + ... + 1318.

2³⁹⁹²⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (441000).

399256 is an abundant number, since it is smaller than the sum of its proper divisors (482744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

399256 is a wasteful number, since it uses less digits than its factorization.

399256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379 (or 375 counting only the distinct ones).

The product of its digits is 14580, while the sum is 34.

The square root of 399256 is about 631.8670746288. The cubic root of 399256 is about 73.6349196301.

The spelling of 399256 in words is "three hundred ninety-nine thousand, two hundred fifty-six".