399630638472 has 128 divisors (see below), whose sum is σ = 1139963932800. Its totient is φ = 115654422528.

The previous prime is 399630638467. The next prime is 399630638501. The reversal of 399630638472 is 274836036993.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8351158 + ... + 8398874.

It is an arithmetic number, because the mean of its divisors is an integer number (8905968225).

Almost surely, 2^399630638472 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 399630638472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (569981966400).

399630638472 is an abundant number, since it is smaller than the sum of its proper divisors (740333294328).

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

399630638472 is a wasteful number, since it uses less digits than its factorization.

399630638472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49335 (or 49331 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 60.

The spelling of 399630638472 in words is "three hundred ninety-nine billion, six hundred thirty million, six hundred thirty-eight thousand, four hundred seventy-two".