9723975138 has 12 divisors (see below), whose sum is σ = 21068612838. Its totient is φ = 3241325040.

The previous prime is 9723975109. The next prime is 9723975139. The reversal of 9723975138 is 8315793279.

9723975138 is a `hidden beast` number, since 97 + 2 + 39 + 7 + 513 + 8 = 666.

9723975138 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 9210816729 + 513158409 = 95973^2 + 22653^2 .

It is not an unprimeable number, because it can be changed into a prime (9723975139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 270110403 + ... + 270110438.

Almost surely, 2^9723975138 is an apocalyptic number.

9723975138 is an abundant number, since it is smaller than the sum of its proper divisors (11344637700).

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

9723975138 is a wasteful number, since it uses less digits than its factorization.

9723975138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540220849 (or 540220846 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 9723975138 is about 98610.2182230625. The cubic root of 9723975138 is about 2134.4268718855.

The spelling of 9723975138 in words is "nine billion, seven hundred twenty-three million, nine hundred seventy-five thousand, one hundred thirty-eight".