79981918 has 8 divisors (see below), whose sum is σ = 120013848. Its totient is φ = 39977304.

The previous prime is 79981907. The next prime is 79981927. The reversal of 79981918 is 81918997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3805 + ... + 13207.

It is an arithmetic number, because the mean of its divisors is an integer number (15001731).

Almost surely, 2^79981918 is an apocalyptic number.

79981918 is a deficient number, since it is larger than the sum of its proper divisors (40031930).

79981918 is a wasteful number, since it uses less digits than its factorization.

79981918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13658.

The product of its digits is 326592, while the sum is 52.

The square root of 79981918 is about 8943.2610383461. The cubic root of 79981918 is about 430.8544718201.

The spelling of 79981918 in words is "seventy-nine million, nine hundred eighty-one thousand, nine hundred eighteen".