399320 has 32 divisors (see below), whose sum is σ = 918000. Its totient is φ = 156288.

The previous prime is 399283. The next prime is 399353. The reversal of 399320 is 23993.

It is a self number, because there is not a number n which added to its sum of digits gives 399320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2606 + ... + 2754.

2³⁹⁹³²⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (459000).

399320 is an abundant number, since it is smaller than the sum of its proper divisors (518680).

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

399320 is a wasteful number, since it uses less digits than its factorization.

399320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227 (or 223 counting only the distinct ones).

The product of its (nonzero) digits is 1458, while the sum is 26.

The square root of 399320 is about 631.9177161625. The cubic root of 399320 is about 73.6388539338.

The spelling of 399320 in words is "three hundred ninety-nine thousand, three hundred twenty".