399879 has 12 divisors (see below), whose sum is σ = 583336. Its totient is φ = 263952.

The previous prime is 399871. The next prime is 399887. The reversal of 399879 is 978993.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (399871) and next prime (399887).

It is not a de Polignac number, because 399879 - 2³ = 399871 is a prime.

It is a Duffinian number.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1272 + ... + 1554.

2³⁹⁹⁸⁷⁹ is an apocalyptic number.

399879 is a deficient number, since it is larger than the sum of its proper divisors (183457).

399879 is a wasteful number, since it uses less digits than its factorization.

399879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446 (or 443 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 399879 is about 632.3598658992. The cubic root of 399879 is about 73.6731997600.

The spelling of 399879 in words is "three hundred ninety-nine thousand, eight hundred seventy-nine".