79999879 has 2 divisors, whose sum is σ = 79999880. Its totient is φ = 79999878.

The previous prime is 79999849. The next prime is 79999973. The reversal of 79999879 is 97899997.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 79999879 - 2¹¹ = 79997831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79999849) 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 as a sum of consecutive naturals, namely, 39999939 + 39999940.

It is an arithmetic number, because the mean of its divisors is an integer number (39999940).

Almost surely, 2^79999879 is an apocalyptic number.

79999879 is a deficient number, since it is larger than the sum of its proper divisors (1).

79999879 is an equidigital number, since it uses as much as digits as its factorization.

79999879 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23147208, while the sum is 67.

The square root of 79999879 is about 8944.2651458910. The cubic root of 79999879 is about 430.8867207674.

The spelling of 79999879 in words is "seventy-nine million, nine hundred ninety-nine thousand, eight hundred seventy-nine".