390915 has 48 divisors (see below), whose sum is σ = 831168. Its totient is φ = 165888.

The previous prime is 390893. The next prime is 390953. The reversal of 390915 is 519093.

390915 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 390915 - 2⁵ = 390883 is a prime.

390915 is strictly pandigital in base 7.

It is a plaindrome in base 11.

It is a nialpdrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5319 + ... + 5391.

It is an arithmetic number, because the mean of its divisors is an integer number (17316).

2³⁹⁰⁹¹⁵ is an apocalyptic number.

390915 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

390915 is an abundant number, since it is smaller than the sum of its proper divisors (440253).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390915 is a wasteful number, since it uses less digits than its factorization.

390915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 105 counting only the distinct ones).

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

The square root of 390915 is about 625.2319569568. The cubic root of 390915 is about 73.1185289036.

The spelling of 390915 in words is "three hundred ninety thousand, nine hundred fifteen".