399715506320 has 40 divisors (see below), whose sum is σ = 1000826135736. Its totient is φ = 147587263488.

The previous prime is 399715506301. The next prime is 399715506347. The reversal of 399715506320 is 23605517993.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7418721424 + 392296784896 = 86132^2 + 626336^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192169877 + ... + 192171956.

Almost surely, 2^399715506320 is an apocalyptic number.

It is an amenable number.

399715506320 is an abundant number, since it is smaller than the sum of its proper divisors (601110629416).

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

399715506320 is a wasteful number, since it uses less digits than its factorization.

399715506320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384341859 (or 384341853 counting only the distinct ones).

The product of its (nonzero) digits is 1530900, while the sum is 50.

The spelling of 399715506320 in words is "three hundred ninety-nine billion, seven hundred fifteen million, five hundred six thousand, three hundred twenty".