399775320 has 288 divisors, whose sum is σ = 1531735920. Its totient is φ = 90155520.

The previous prime is 399775319. The next prime is 399775331. The reversal of 399775320 is 23577993.

It is a super-2 number, since 2×399775320² = 319640612962204800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2310754 + ... + 2310926.

Almost surely, 2^399775320 is an apocalyptic number.

399775320 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 399775320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (765867960).

399775320 is an abundant number, since it is smaller than the sum of its proper divisors (1131960600).

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

399775320 is a wasteful number, since it uses less digits than its factorization.

399775320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 321 counting only the distinct ones).

The product of its (nonzero) digits is 357210, while the sum is 45.

The square root of 399775320 is about 19994.3822110112. The cubic root of 399775320 is about 736.6683191908.

The spelling of 399775320 in words is "three hundred ninety-nine million, seven hundred seventy-five thousand, three hundred twenty".