399510328320 has 132 divisors (see below), whose sum is σ = 1384293043380. Its totient is φ = 106536075264.

The previous prime is 399510328249. The next prime is 399510328331. The reversal of 399510328320 is 23823015993.

399510328320 is a `hidden beast` number, since 3 + 9 + 9 + 510 + 32 + 83 + 20 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 113995367424 + 285514960896 = 337632^2 + 534336^2 .

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 11 ways as a sum of consecutive naturals, for example, 4288885 + ... + 4381044.

Almost surely, 2^399510328320 is an apocalyptic number.

399510328320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

399510328320 is an abundant number, since it is smaller than the sum of its proper divisors (984782715060).

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

399510328320 is a wasteful number, since it uses less digits than its factorization.

399510328320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8669960 (or 8669939 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The spelling of 399510328320 in words is "three hundred ninety-nine billion, five hundred ten million, three hundred twenty-eight thousand, three hundred twenty".