79976909 has 4 divisors (see below), whose sum is σ = 84186240. Its totient is φ = 75767580.

The previous prime is 79976903. The next prime is 79976921. The reversal of 79976909 is 90967997.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90967997 = 6997 ⋅13001.

It is a cyclic number.

It is not a de Polignac number, because 79976909 - 2⁴ = 79976893 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 (79976903) 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, 2104637 + ... + 2104674.

It is an arithmetic number, because the mean of its divisors is an integer number (21046560).

Almost surely, 2^79976909 is an apocalyptic number.

It is an amenable number.

79976909 is a deficient number, since it is larger than the sum of its proper divisors (4209331).

79976909 is a wasteful number, since it uses less digits than its factorization.

79976909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209330.

The product of its (nonzero) digits is 1928934, while the sum is 56.

The square root of 79976909 is about 8942.9809906988. The cubic root of 79976909 is about 430.8454773076.

The spelling of 79976909 in words is "seventy-nine million, nine hundred seventy-six thousand, nine hundred nine".