390591 has 6 divisors (see below), whose sum is σ = 564200. Its totient is φ = 260388.

The previous prime is 390581. The next prime is 390647. The reversal of 390591 is 195093.

It is not a de Polignac number, because 390591 - 2⁶ = 390527 is a prime.

It is a super-2 number, since 2×390591² = 305122658562, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 5.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21691 + ... + 21708.

2³⁹⁰⁵⁹¹ is an apocalyptic number.

390591 is a deficient number, since it is larger than the sum of its proper divisors (173609).

390591 is a wasteful number, since it uses less digits than its factorization.

390591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43405 (or 43402 counting only the distinct ones).

The product of its (nonzero) digits is 1215, while the sum is 27.

The square root of 390591 is about 624.9727994081. The cubic root of 390591 is about 73.0983225063.

Subtracting from 390591 its product of nonzero digits (1215), we obtain a square (389376 = 624²).

It can be divided in two parts, 39059 and 1, that added together give a triangular number (39060 = T₂₇₉).

The spelling of 390591 in words is "three hundred ninety thousand, five hundred ninety-one".