79291138 has 4 divisors (see below), whose sum is σ = 118936710. Its totient is φ = 39645568.

The previous prime is 79291129. The next prime is 79291193. The reversal of 79291138 is 83119297.

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., 71690089 + 7601049 = 8467^2 + 2757^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 79291138.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19822783 + ... + 19822786.

Almost surely, 2^79291138 is an apocalyptic number.

79291138 is a deficient number, since it is larger than the sum of its proper divisors (39645572).

79291138 is a wasteful number, since it uses less digits than its factorization.

79291138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39645571.

The product of its digits is 27216, while the sum is 40.

The square root of 79291138 is about 8904.5571478878. The cubic root of 79291138 is about 429.6104963931.

The spelling of 79291138 in words is "seventy-nine million, two hundred ninety-one thousand, one hundred thirty-eight".