399113220 has 96 divisors (see below), whose sum is σ = 1258500096. Its totient is φ = 93628800.

The previous prime is 399113207. The next prime is 399113279. The reversal of 399113220 is 22311993.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10707 + ... + 30213.

It is an arithmetic number, because the mean of its divisors is an integer number (13109376).

Almost surely, 2^399113220 is an apocalyptic number.

399113220 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 399113220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (629250048).

399113220 is an abundant number, since it is smaller than the sum of its proper divisors (859386876).

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

399113220 is a wasteful number, since it uses less digits than its factorization.

399113220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19561 (or 19559 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 399113220 is about 19977.8181991928. The cubic root of 399113220 is about 736.2614092891.

The spelling of 399113220 in words is "three hundred ninety-nine million, one hundred thirteen thousand, two hundred twenty".