79388891 has 4 divisors (see below), whose sum is σ = 79409400. Its totient is φ = 79368384.

The previous prime is 79388873. The next prime is 79388899. The reversal of 79388891 is 19888397.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19888397 = 401 ⋅49597.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79388891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79388899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2486 + ... + 12843.

It is an arithmetic number, because the mean of its divisors is an integer number (19852350).

Almost surely, 2^79388891 is an apocalyptic number.

79388891 is a deficient number, since it is larger than the sum of its proper divisors (20509).

79388891 is a wasteful number, since it uses less digits than its factorization.

79388891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20508.

The product of its digits is 870912, while the sum is 53.

The square root of 79388891 is about 8910.0443882172. The cubic root of 79388891 is about 429.7869703757.

The spelling of 79388891 in words is "seventy-nine million, three hundred eighty-eight thousand, eight hundred ninety-one".