391956 has 24 divisors (see below), whose sum is σ = 927360. Its totient is φ = 128832.

The previous prime is 391939. The next prime is 391961. The reversal of 391956 is 659193.

It is a congruent number.

It is an unprimeable number.

391956 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 885 + ... + 1251.

It is an arithmetic number, because the mean of its divisors is an integer number (38640).

2³⁹¹⁹⁵⁶ is an apocalyptic number.

It is an amenable number.

391956 is an abundant number, since it is smaller than the sum of its proper divisors (535404).

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

391956 is a wasteful number, since it uses less digits than its factorization.

391956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463 (or 461 counting only the distinct ones).

The product of its digits is 7290, while the sum is 33.

The square root of 391956 is about 626.0638945028. The cubic root of 391956 is about 73.1833758420.

The spelling of 391956 in words is "three hundred ninety-one thousand, nine hundred fifty-six".