9399131856 has 30 divisors (see below), whose sum is σ = 26304515250. Its totient is φ = 3133043904.

The previous prime is 9399131837. The next prime is 9399131891. The reversal of 9399131856 is 6581319939.

It can be written as a sum of positive squares in only one way, i.e., 8284640400 + 1114491456 = 91020^2 + 33384^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32635731 + ... + 32636018.

It is an arithmetic number, because the mean of its divisors is an integer number (876817175).

Almost surely, 2^9399131856 is an apocalyptic number.

It is an amenable number.

9399131856 is an abundant number, since it is smaller than the sum of its proper divisors (16905383394).

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

9399131856 is a wasteful number, since it uses less digits than its factorization.

9399131856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65271763 (or 65271754 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 54.

The square root of 9399131856 is about 96949.1199341180. The cubic root of 9399131856 is about 2110.3893216306.

The spelling of 9399131856 in words is "nine billion, three hundred ninety-nine million, one hundred thirty-one thousand, eight hundred fifty-six".