399275520 has 240 divisors, whose sum is σ = 1486230768. Its totient is φ = 91176960.

The previous prime is 399275501. The next prime is 399275533. The reversal of 399275520 is 25572993.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 375790 + ... + 376850.

Almost surely, 2^399275520 is an apocalyptic number.

399275520 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 399275520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (743115384).

399275520 is an abundant number, since it is smaller than the sum of its proper divisors (1086955248).

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

399275520 is a wasteful number, since it uses less digits than its factorization.

399275520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 170100, while the sum is 42.

The square root of 399275520 is about 19981.8797914511. The cubic root of 399275520 is about 736.3611963727.

The spelling of 399275520 in words is "three hundred ninety-nine million, two hundred seventy-five thousand, five hundred twenty".