389931 has 8 divisors (see below), whose sum is σ = 528960. Its totient is φ = 255432.

The previous prime is 389927. The next prime is 389941. The reversal of 389931 is 139983.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 389931 - 2² = 389927 is a prime.

It is a super-2 number, since 2×389931² = 304092369522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 389892 and 389901.

It is not an unprimeable number, because it can be changed into a prime (389911) 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, 925 + ... + 1278.

It is an arithmetic number, because the mean of its divisors is an integer number (66120).

2³⁸⁹⁹³¹ is an apocalyptic number.

389931 is a deficient number, since it is larger than the sum of its proper divisors (139029).

389931 is a wasteful number, since it uses less digits than its factorization.

389931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265.

The product of its digits is 5832, while the sum is 33.

The square root of 389931 is about 624.4445531831. Note that the first 3 decimals coincide. The cubic root of 389931 is about 73.0571267352.

The spelling of 389931 in words is "three hundred eighty-nine thousand, nine hundred thirty-one".