399888 has 30 divisors (see below), whose sum is σ = 1119534. Its totient is φ = 133248.

The previous prime is 399887. The next prime is 399899. The reversal of 399888 is 888993.

It can be written as a sum of positive squares in only one way, i.e., 278784 + 121104 = 528^2 + 348^2 .

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399887) 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, 1245 + ... + 1532.

2³⁹⁹⁸⁸⁸ is an apocalyptic number.

It is an amenable number.

399888 is an abundant number, since it is smaller than the sum of its proper divisors (719646).

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

399888 is a wasteful number, since it uses less digits than its factorization.

399888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791 (or 2782 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 399888 is about 632.3669820603. The cubic root of 399888 is about 73.6737524721.

The spelling of 399888 in words is "three hundred ninety-nine thousand, eight hundred eighty-eight".