399339720 has 320 divisors, whose sum is σ = 1524600000. Its totient is φ = 92938752.

The previous prime is 399339697. The next prime is 399339749. The reversal of 399339720 is 27933993.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 800031 + ... + 800529.

It is an arithmetic number, because the mean of its divisors is an integer number (4764375).

Almost surely, 2^399339720 is an apocalyptic number.

399339720 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 399339720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (762300000).

399339720 is an abundant number, since it is smaller than the sum of its proper divisors (1125260280).

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

399339720 is a wasteful number, since it uses less digits than its factorization.

399339720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554 (or 541 counting only the distinct ones).

The product of its (nonzero) digits is 275562, while the sum is 45.

The square root of 399339720 is about 19983.4861823457. The cubic root of 399339720 is about 736.4006610639.

The spelling of 399339720 in words is "three hundred ninety-nine million, three hundred thirty-nine thousand, seven hundred twenty".