79487139 has 4 divisors (see below), whose sum is σ = 105982856. Its totient is φ = 52991424.

The previous prime is 79487129. The next prime is 79487143. The reversal of 79487139 is 93178497.

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

It is a de Polignac number, because none of the positive numbers 2^k-79487139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79487129) 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 3 ways as a sum of consecutive naturals, for example, 13247854 + ... + 13247859.

It is an arithmetic number, because the mean of its divisors is an integer number (26495714).

Almost surely, 2^79487139 is an apocalyptic number.

79487139 is a deficient number, since it is larger than the sum of its proper divisors (26495717).

79487139 is a wasteful number, since it uses less digits than its factorization.

79487139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26495716.

The product of its digits is 381024, while the sum is 48.

The square root of 79487139 is about 8915.5560118256. The cubic root of 79487139 is about 429.9641920786.

The spelling of 79487139 in words is "seventy-nine million, four hundred eighty-seven thousand, one hundred thirty-nine".