399087 has 20 divisors (see below), whose sum is σ = 643720. Its totient is φ = 244944.

The previous prime is 399079. The next prime is 399097. The reversal of 399087 is 780993.

It is not a de Polignac number, because 399087 - 2³ = 399079 is a prime.

It is a Duffinian number.

399087 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399067) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 864 + ... + 1242.

It is an arithmetic number, because the mean of its divisors is an integer number (32186).

2³⁹⁹⁰⁸⁷ is an apocalyptic number.

399087 is a deficient number, since it is larger than the sum of its proper divisors (244633).

399087 is a wasteful number, since it uses less digits than its factorization.

399087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 399087 is about 631.7333298157. The cubic root of 399087 is about 73.6245285880.

The spelling of 399087 in words is "three hundred ninety-nine thousand, eighty-seven".