9972139136 has 64 divisors (see below), whose sum is σ = 20049120000. Its totient is φ = 4940414976.

The previous prime is 9972139127. The next prime is 9972139171. The reversal of 9972139136 is 6319312799.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9597305 + ... + 9598343.

It is an arithmetic number, because the mean of its divisors is an integer number (313267500).

Almost surely, 2^9972139136 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 9972139136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10024560000).

9972139136 is an abundant number, since it is smaller than the sum of its proper divisors (10076980864).

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

9972139136 is a wasteful number, since it uses less digits than its factorization.

9972139136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669 (or 1657 counting only the distinct ones).

The product of its digits is 551124, while the sum is 50.

The square root of 9972139136 is about 99860.5985161315. The cubic root of 9972139136 is about 2152.4320152739.

The spelling of 9972139136 in words is "nine billion, nine hundred seventy-two million, one hundred thirty-nine thousand, one hundred thirty-six".