390986 has 4 divisors (see below), whose sum is σ = 586482. Its totient is φ = 195492.

The previous prime is 390967. The next prime is 390989. The reversal of 390986 is 689093.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 390625 + 361 = 625^2 + 19^2 .

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 97745 + ... + 97748.

2³⁹⁰⁹⁸⁶ is an apocalyptic number.

390986 is a deficient number, since it is larger than the sum of its proper divisors (195496).

390986 is a wasteful number, since it uses less digits than its factorization.

390986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195495.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 390986 is about 625.2887333065. The cubic root of 390986 is about 73.1229553572.

The spelling of 390986 in words is "three hundred ninety thousand, nine hundred eighty-six".