79142709 has 4 divisors (see below), whose sum is σ = 105523616. Its totient is φ = 52761804.

The previous prime is 79142677. The next prime is 79142729. The reversal of 79142709 is 90724197.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 79142709 - 2⁵ = 79142677 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 (79142729) 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, 13190449 + ... + 13190454.

It is an arithmetic number, because the mean of its divisors is an integer number (26380904).

Almost surely, 2^79142709 is an apocalyptic number.

It is an amenable number.

79142709 is a deficient number, since it is larger than the sum of its proper divisors (26380907).

79142709 is a wasteful number, since it uses less digits than its factorization.

79142709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26380906.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 79142709 is about 8896.2188035142. The cubic root of 79142709 is about 429.3422592410.

The spelling of 79142709 in words is "seventy-nine million, one hundred forty-two thousand, seven hundred nine".