399875 has 16 divisors (see below), whose sum is σ = 571584. Its totient is φ = 273600.

The previous prime is 399871. The next prime is 399887. The reversal of 399875 is 578993.

399875 = 236² + 237² + ... + 242².

It is not a de Polignac number, because 399875 - 2² = 399871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 647 + ... + 1103.

It is an arithmetic number, because the mean of its divisors is an integer number (35724).

2³⁹⁹⁸⁷⁵ is an apocalyptic number.

399875 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

399875 is a deficient number, since it is larger than the sum of its proper divisors (171709).

399875 is an equidigital number, since it uses as much as digits as its factorization.

399875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479 (or 469 counting only the distinct ones).

The product of its digits is 68040, while the sum is 41.

The square root of 399875 is about 632.3567031352. The cubic root of 399875 is about 73.6729541076.

The spelling of 399875 in words is "three hundred ninety-nine thousand, eight hundred seventy-five".