399679220528 has 80 divisors (see below), whose sum is σ = 939674856960. Its totient is φ = 160765805568.

The previous prime is 399679220527. The next prime is 399679220533. The reversal of 399679220528 is 825022976993.

It is not an unprimeable number, because it can be changed into a prime (399679220527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 391175 + ... + 975897.

It is an arithmetic number, because the mean of its divisors is an integer number (11745935712).

Almost surely, 2^399679220528 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 399679220528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469837428480).

399679220528 is an abundant number, since it is smaller than the sum of its proper divisors (539995636432).

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

399679220528 is a wasteful number, since it uses less digits than its factorization.

399679220528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585114 (or 585108 counting only the distinct ones).

The product of its (nonzero) digits is 29393280, while the sum is 62.

The spelling of 399679220528 in words is "three hundred ninety-nine billion, six hundred seventy-nine million, two hundred twenty thousand, five hundred twenty-eight".