79139985 has 16 divisors (see below), whose sum is σ = 130991040. Its totient is φ = 40752320.

The previous prime is 79139917. The next prime is 79139989. The reversal of 79139985 is 58993197.

It is a happy number.

It is not a de Polignac number, because 79139985 - 2⁷ = 79139857 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (79139989) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 90531 + ... + 91400.

It is an arithmetic number, because the mean of its divisors is an integer number (8186940).

Almost surely, 2^79139985 is an apocalyptic number.

It is an amenable number.

79139985 is a deficient number, since it is larger than the sum of its proper divisors (51851055).

79139985 is a wasteful number, since it uses less digits than its factorization.

79139985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181968.

The product of its digits is 612360, while the sum is 51.

The square root of 79139985 is about 8896.0657034444. The cubic root of 79139985 is about 429.3373333641.

The spelling of 79139985 in words is "seventy-nine million, one hundred thirty-nine thousand, nine hundred eighty-five".