391936 has 18 divisors (see below), whose sum is σ = 782852. Its totient is φ = 195840.

The previous prime is 391921. The next prime is 391939. The reversal of 391936 is 639193.

It is a super-2 number, since 2×391936² = 307227656192, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 391898 and 391907.

It is not an unprimeable number, because it can be changed into a prime (391939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510 + ... + 1021.

2³⁹¹⁹³⁶ is an apocalyptic number.

It is an amenable number.

391936 is a deficient number, since it is larger than the sum of its proper divisors (390916).

391936 is an equidigital number, since it uses as much as digits as its factorization.

391936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1547 (or 1533 counting only the distinct ones).

The product of its digits is 4374, while the sum is 31.

The square root of 391936 is about 626.0479214884. The cubic root of 391936 is about 73.1821310659.

The spelling of 391936 in words is "three hundred ninety-one thousand, nine hundred thirty-six".