399056696320 has 88 divisors (see below), whose sum is σ = 967138376904. Its totient is φ = 157976887296.

The previous prime is 399056696281. The next prime is 399056696327. The reversal of 399056696320 is 23696650993.

It can be written as a sum of positive squares in 4 ways, for example, as 1733223424 + 397323472896 = 41632^2 + 630336^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399056696327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94884 + ... + 898396.

Almost surely, 2^399056696320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399056696320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (483569188452).

399056696320 is an abundant number, since it is smaller than the sum of its proper divisors (568081680584).

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

399056696320 is an equidigital number, since it uses as much as digits as its factorization.

399056696320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 803635 (or 803617 counting only the distinct ones).

The product of its (nonzero) digits is 14171760, while the sum is 58.

The spelling of 399056696320 in words is "three hundred ninety-nine billion, fifty-six million, six hundred ninety-six thousand, three hundred twenty".