7972159987 has 8 divisors (see below), whose sum is σ = 8717564592. Its totient is φ = 7230199200.

The previous prime is 7972159969. The next prime is 7972159999. The reversal of 7972159987 is 7899512797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7972159987 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7972159487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856108 + ... + 865369.

It is an arithmetic number, because the mean of its divisors is an integer number (1089695574).

Almost surely, 2^7972159987 is an apocalyptic number.

7972159987 is a deficient number, since it is larger than the sum of its proper divisors (745404605).

7972159987 is a wasteful number, since it uses less digits than its factorization.

7972159987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721909.

The product of its digits is 20003760, while the sum is 64.

The square root of 7972159987 is about 89286.9530614636. The cubic root of 7972159987 is about 1997.6773024991.

The spelling of 7972159987 in words is "seven billion, nine hundred seventy-two million, one hundred fifty-nine thousand, nine hundred eighty-seven".