79200139 has 4 divisors (see below), whose sum is σ = 79424856. Its totient is φ = 78975424.

The previous prime is 79200119. The next prime is 79200157. The reversal of 79200139 is 93100297.

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

It is a cyclic number.

It is not a de Polignac number, because 79200139 - 2¹³ = 79191947 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79200139.

It is not an unprimeable number, because it can be changed into a prime (79200119) 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, 111829 + ... + 112534.

It is an arithmetic number, because the mean of its divisors is an integer number (19856214).

Almost surely, 2^79200139 is an apocalyptic number.

79200139 is a deficient number, since it is larger than the sum of its proper divisors (224717).

79200139 is a wasteful number, since it uses less digits than its factorization.

79200139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224716.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 79200139 is about 8899.4459939931. The cubic root of 79200139 is about 429.4460850367.

The spelling of 79200139 in words is "seventy-nine million, two hundred thousand, one hundred thirty-nine".