79979447 has 2 divisors, whose sum is σ = 79979448. Its totient is φ = 79979446.

The previous prime is 79979437. The next prime is 79979453. The reversal of 79979447 is 74497997.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79979447 - 2¹⁸ = 79717303 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 79979392 and 79979401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79979437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39989723 + 39989724.

It is an arithmetic number, because the mean of its divisors is an integer number (39989724).

Almost surely, 2^79979447 is an apocalyptic number.

79979447 is a deficient number, since it is larger than the sum of its proper divisors (1).

79979447 is an equidigital number, since it uses as much as digits as its factorization.

79979447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4000752, while the sum is 56.

The square root of 79979447 is about 8943.1228885664. The cubic root of 79979447 is about 430.8500347657.

The spelling of 79979447 in words is "seventy-nine million, nine hundred seventy-nine thousand, four hundred forty-seven".