7972138197 has 6 divisors (see below), whose sum is σ = 11515310742. Its totient is φ = 5314758792.

The previous prime is 7972138177. The next prime is 7972138211. The reversal of 7972138197 is 7918312797.

It can be written as a sum of positive squares in only one way, i.e., 7905699396 + 66438801 = 88914^2 + 8151^2 .

It is not a de Polignac number, because 7972138197 - 2⁶ = 7972138133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7972138147) 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 5 ways as a sum of consecutive naturals, for example, 442896558 + ... + 442896575.

It is an arithmetic number, because the mean of its divisors is an integer number (1919218457).

Almost surely, 2^7972138197 is an apocalyptic number.

It is an amenable number.

7972138197 is a deficient number, since it is larger than the sum of its proper divisors (3543172545).

7972138197 is a wasteful number, since it uses less digits than its factorization.

7972138197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 885793139 (or 885793136 counting only the distinct ones).

The product of its digits is 1333584, while the sum is 54.

The square root of 7972138197 is about 89286.8310390732. The cubic root of 7972138197 is about 1997.6754824391.

The spelling of 7972138197 in words is "seven billion, nine hundred seventy-two million, one hundred thirty-eight thousand, one hundred ninety-seven".