79997938 has 4 divisors (see below), whose sum is σ = 119996910. Its totient is φ = 39998968.

The previous prime is 79997927. The next prime is 79997947. The reversal of 79997938 is 83979997.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 57501889 + 22496049 = 7583^2 + 4743^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19999483 + ... + 19999486.

Almost surely, 2^79997938 is an apocalyptic number.

79997938 is a deficient number, since it is larger than the sum of its proper divisors (39998972).

79997938 is a wasteful number, since it uses less digits than its factorization.

79997938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39998971.

The product of its digits is 7715736, while the sum is 61.

The square root of 79997938 is about 8944.1566399521. The cubic root of 79997938 is about 430.8832359376.

The spelling of 79997938 in words is "seventy-nine million, nine hundred ninety-seven thousand, nine hundred thirty-eight".