399900 has 72 divisors (see below), whose sum is σ = 1222144. Its totient is φ = 100800.

The previous prime is 399899. The next prime is 399911. The reversal of 399900 is 9993.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9279 + ... + 9321.

2³⁹⁹⁹⁰⁰ is an apocalyptic number.

399900 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (611072).

399900 is an abundant number, since it is smaller than the sum of its proper divisors (822244).

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

399900 is a wasteful number, since it uses less digits than its factorization.

399900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 2187, while the sum is 30.

The square root of 399900 is about 632.3764701505. The cubic root of 399900 is about 73.6744894086.

The spelling of 399900 in words is "three hundred ninety-nine thousand, nine hundred".