79138799 has 2 divisors, whose sum is σ = 79138800. Its totient is φ = 79138798.

The previous prime is 79138793. The next prime is 79138823. The reversal of 79138799 is 99783197.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79138799 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 79138799.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79138793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39569399 + 39569400.

It is an arithmetic number, because the mean of its divisors is an integer number (39569400).

Almost surely, 2^79138799 is an apocalyptic number.

79138799 is a deficient number, since it is larger than the sum of its proper divisors (1).

79138799 is an equidigital number, since it uses as much as digits as its factorization.

79138799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 53.

The square root of 79138799 is about 8895.9990445143. Note that the first 3 decimals coincide. The cubic root of 79138799 is about 429.3351886555.

The spelling of 79138799 in words is "seventy-nine million, one hundred thirty-eight thousand, seven hundred ninety-nine".