79669839 has 4 divisors (see below), whose sum is σ = 106226456. Its totient is φ = 53113224.

The previous prime is 79669823. The next prime is 79669867. The reversal of 79669839 is 93896697.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79669839 - 2⁴ = 79669823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79669819) 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, 13278304 + ... + 13278309.

It is an arithmetic number, because the mean of its divisors is an integer number (26556614).

Almost surely, 2^79669839 is an apocalyptic number.

79669839 is a deficient number, since it is larger than the sum of its proper divisors (26556617).

79669839 is a wasteful number, since it uses less digits than its factorization.

79669839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26556616.

The product of its digits is 4408992, while the sum is 57.

The square root of 79669839 is about 8925.7962670005. The cubic root of 79669839 is about 430.2933620978.

It can be divided in two parts, 79669 and 839, that added together give a palindrome (80508).

The spelling of 79669839 in words is "seventy-nine million, six hundred sixty-nine thousand, eight hundred thirty-nine".