390884 has 12 divisors (see below), whose sum is σ = 736764. Its totient is φ = 180384.

The previous prime is 390883. The next prime is 390889. The reversal of 390884 is 488093.

It can be written as a sum of positive squares in 2 ways, for example, as 222784 + 168100 = 472^2 + 410^2 .

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 390884.

It is not an unprimeable number, because it can be changed into a prime (390883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3707 + ... + 3810.

It is an arithmetic number, because the mean of its divisors is an integer number (61397).

2³⁹⁰⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

390884 is a deficient number, since it is larger than the sum of its proper divisors (345880).

390884 is a wasteful number, since it uses less digits than its factorization.

390884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7534 (or 7532 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 390884 is about 625.2071656659. The cubic root of 390884 is about 73.1165960586.

The spelling of 390884 in words is "three hundred ninety thousand, eight hundred eighty-four".