79138823 has 2 divisors, whose sum is σ = 79138824. Its totient is φ = 79138822.

The previous prime is 79138799. The next prime is 79138831. The reversal of 79138823 is 32883197.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 79138823 - 2²⁶ = 12029959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79138223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39569411 + 39569412.

It is an arithmetic number, because the mean of its divisors is an integer number (39569412).

Almost surely, 2^79138823 is an apocalyptic number.

79138823 is a deficient number, since it is larger than the sum of its proper divisors (1).

79138823 is an equidigital number, since it uses as much as digits as its factorization.

79138823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 79138823 is about 8896.0003934352. Note that the first 3 decimals coincide. The cubic root of 79138823 is about 429.3352320562.

The spelling of 79138823 in words is "seventy-nine million, one hundred thirty-eight thousand, eight hundred twenty-three".