79871993 has 4 divisors (see below), whose sum is σ = 80224080. Its totient is φ = 79519908.

The previous prime is 79871929. The next prime is 79872019. The reversal of 79871993 is 39917897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 79871993 - 2⁶ = 79871929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79873993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175703 + ... + 176156.

It is an arithmetic number, because the mean of its divisors is an integer number (20056020).

Almost surely, 2^79871993 is an apocalyptic number.

It is an amenable number.

79871993 is a deficient number, since it is larger than the sum of its proper divisors (352087).

79871993 is a wasteful number, since it uses less digits than its factorization.

79871993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352086.

The product of its digits is 857304, while the sum is 53.

The square root of 79871993 is about 8937.1132363868. The cubic root of 79871993 is about 430.6569963860.

The spelling of 79871993 in words is "seventy-nine million, eight hundred seventy-one thousand, nine hundred ninety-three".