390031 has 4 divisors (see below), whose sum is σ = 412992. Its totient is φ = 367072.

The previous prime is 390001. The next prime is 390043. The reversal of 390031 is 130093.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 390031 - 2⁵ = 389999 is a prime.

It is a super-2 number, since 2×390031² = 304248361922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 389987 and 390014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11455 + ... + 11488.

It is an arithmetic number, because the mean of its divisors is an integer number (103248).

2³⁹⁰⁰³¹ is an apocalyptic number.

390031 is a deficient number, since it is larger than the sum of its proper divisors (22961).

390031 is a wasteful number, since it uses less digits than its factorization.

390031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22960.

The product of its (nonzero) digits is 81, while the sum is 16.

The square root of 390031 is about 624.5246192105. The cubic root of 390031 is about 73.0633715052.

The spelling of 390031 in words is "three hundred ninety thousand, thirty-one".