79972 has 6 divisors (see below), whose sum is σ = 139958. Its totient is φ = 39984.

The previous prime is 79967. The next prime is 79973. The reversal of 79972 is 27997.

It can be written as a sum of positive squares in only one way, i.e., 70756 + 9216 = 266^2 + 96^2 .

It is not an unprimeable number, because it can be changed into a prime (79973) by changing a digit.

79972 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9993 + ... + 10000.

2⁷⁹⁹⁷² is an apocalyptic number.

It is an amenable number.

79972 is a deficient number, since it is larger than the sum of its proper divisors (59986).

79972 is a wasteful number, since it uses less digits than its factorization.

79972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19997 (or 19995 counting only the distinct ones).

The product of its digits is 7938, while the sum is 34.

The square root of 79972 is about 282.7932106681. The cubic root of 79972 is about 43.0836661998.

The spelling of 79972 in words is "seventy-nine thousand, nine hundred seventy-two".