390988 has 24 divisors (see below), whose sum is σ = 754208. Its totient is φ = 176256.

The previous prime is 390967. The next prime is 390989. The reversal of 390988 is 889093.

It is a super-2 number, since 2×390988² = 305743232288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (390989) 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, 3745 + ... + 3847.

2³⁹⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

390988 is a deficient number, since it is larger than the sum of its proper divisors (363220).

390988 is a wasteful number, since it uses less digits than its factorization.

390988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 390988 is about 625.2903325656. The cubic root of 390988 is about 73.1230800382.

It can be divided in two parts, 390 and 988, that added together give a triangular number (1378 = T₅₂).

The spelling of 390988 in words is "three hundred ninety thousand, nine hundred eighty-eight".