391964 has 24 divisors (see below), whose sum is σ = 739200. Its totient is φ = 181440.

The previous prime is 391961. The next prime is 391967. The reversal of 391964 is 469193.

391964 = T₉ + T₁₀ + ... + T₁₃₂.

It is an interprime number because it is at equal distance from previous prime (391961) and next prime (391967).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 391964.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3542 + ... + 3650.

It is an arithmetic number, because the mean of its divisors is an integer number (30800).

2³⁹¹⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

391964 is a deficient number, since it is larger than the sum of its proper divisors (347236).

391964 is a wasteful number, since it uses less digits than its factorization.

391964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173 (or 171 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 391964 is about 626.0702835944. The cubic root of 391964 is about 73.1838737406.

The spelling of 391964 in words is "three hundred ninety-one thousand, nine hundred sixty-four".