39991163520 has 1024 divisors, whose sum is σ = 174845952000. Its totient is φ = 7518044160.

The previous prime is 39991163507. The next prime is 39991163549. The reversal of 39991163520 is 2536119993.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 39991163520.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 64605771 + ... + 64606389.

It is an arithmetic number, because the mean of its divisors is an integer number (170748000).

Almost surely, 2^39991163520 is an apocalyptic number.

39991163520 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 39991163520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87422976000).

39991163520 is an abundant number, since it is smaller than the sum of its proper divisors (134854788480).

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

39991163520 is a wasteful number, since it uses less digits than its factorization.

39991163520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 393660, while the sum is 48.

The spelling of 39991163520 in words is "thirty-nine billion, nine hundred ninety-one million, one hundred sixty-three thousand, five hundred twenty".