391456 has 24 divisors (see below), whose sum is σ = 830844. Its totient is φ = 180480.

The previous prime is 391453. The next prime is 391487. The reversal of 391456 is 654193.

It can be written as a sum of positive squares in 2 ways, for example, as 384400 + 7056 = 620^2 + 84^2 .

It is a Smith number, since the sum of its digits (28) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (391451) 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, 55 + ... + 886.

2³⁹¹⁴⁵⁶ is an apocalyptic number.

It is an amenable number.

391456 is an abundant number, since it is smaller than the sum of its proper divisors (439388).

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

391456 is a wasteful number, since it uses less digits than its factorization.

391456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 964 (or 956 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 391456 is about 625.6644468084. The cubic root of 391456 is about 73.1522437265.

The spelling of 391456 in words is "three hundred ninety-one thousand, four hundred fifty-six".