79979449 has 4 divisors (see below), whose sum is σ = 87250320. Its totient is φ = 72708580.

The previous prime is 79979447. The next prime is 79979453. The reversal of 79979449 is 94497997.

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: 94497997 = 11 ⋅8590727.

It is a cyclic number.

It is not a de Polignac number, because 79979449 - 2¹ = 79979447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79979393 and 79979402.

It is not an unprimeable number, because it can be changed into a prime (79979447) 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, 3635419 + ... + 3635440.

It is an arithmetic number, because the mean of its divisors is an integer number (21812580).

Almost surely, 2^79979449 is an apocalyptic number.

It is an amenable number.

79979449 is a deficient number, since it is larger than the sum of its proper divisors (7270871).

79979449 is a wasteful number, since it uses less digits than its factorization.

79979449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7270870.

The product of its digits is 5143824, while the sum is 58.

The square root of 79979449 is about 8943.1230003841. The cubic root of 79979449 is about 430.8500383571.

The spelling of 79979449 in words is "seventy-nine million, nine hundred seventy-nine thousand, four hundred forty-nine".