399976 has 24 divisors (see below), whose sum is σ = 801270. Its totient is φ = 187136.

The previous prime is 399953. The next prime is 399979. The reversal of 399976 is 679993.

It can be written as a sum of positive squares in 3 ways, for example, as 391876 + 8100 = 626^2 + 90^2 .

It is not an unprimeable number, because it can be changed into a prime (399979) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2226 + ... + 2398.

2³⁹⁹⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

399976 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

399976 is a wasteful number, since it uses less digits than its factorization.

399976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 192 counting only the distinct ones).

The product of its digits is 91854, while the sum is 43.

The square root of 399976 is about 632.4365580831. The cubic root of 399976 is about 73.6791563307.

The spelling of 399976 in words is "three hundred ninety-nine thousand, nine hundred seventy-six".