399960 has 96 divisors (see below), whose sum is σ = 1432080. Its totient is φ = 96000.

The previous prime is 399953. The next prime is 399979. The reversal of 399960 is 69993.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 3910 + ... + 4010.

2³⁹⁹⁹⁶⁰ is an apocalyptic number.

399960 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 399960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (716040).

399960 is an abundant number, since it is smaller than the sum of its proper divisors (1032120).

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

399960 is a wasteful number, since it uses less digits than its factorization.

399960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129 (or 122 counting only the distinct ones).

The product of its (nonzero) digits is 13122, while the sum is 36.

The square root of 399960 is about 632.4239084665. The cubic root of 399960 is about 73.6781738699.

It can be divided in two parts, 39 and 9960, that added together give a palindrome (9999).

The spelling of 399960 in words is "three hundred ninety-nine thousand, nine hundred sixty".