79993918 has 4 divisors (see below), whose sum is σ = 119990880. Its totient is φ = 39996958.

The previous prime is 79993909. The next prime is 79993937. The reversal of 79993918 is 81939997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81939997 = 1567 ⋅52291.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19998478 + ... + 19998481.

It is an arithmetic number, because the mean of its divisors is an integer number (29997720).

Almost surely, 2^79993918 is an apocalyptic number.

79993918 is a deficient number, since it is larger than the sum of its proper divisors (39996962).

79993918 is a wasteful number, since it uses less digits than its factorization.

79993918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39996961.

The product of its digits is 1102248, while the sum is 55.

The square root of 79993918 is about 8943.9319094009. The cubic root of 79993918 is about 430.8760183365.

The spelling of 79993918 in words is "seventy-nine million, nine hundred ninety-three thousand, nine hundred eighteen".