391056 has 20 divisors (see below), whose sum is σ = 1010352. Its totient is φ = 130336.

The previous prime is 391049. The next prime is 391057. The reversal of 391056 is 650193.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (391057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4026 + ... + 4121.

2³⁹¹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

391056 is an abundant number, since it is smaller than the sum of its proper divisors (619296).

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

391056 is a wasteful number, since it uses less digits than its factorization.

391056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8158 (or 8152 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 24.

The square root of 391056 is about 625.3447049428. The cubic root of 391056 is about 73.1273189417.

The spelling of 391056 in words is "three hundred ninety-one thousand, fifty-six".