79977823 has 2 divisors, whose sum is σ = 79977824. Its totient is φ = 79977822.

The previous prime is 79977817. The next prime is 79977827. The reversal of 79977823 is 32877997.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79977823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79977827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39988911 + 39988912.

It is an arithmetic number, because the mean of its divisors is an integer number (39988912).

Almost surely, 2^79977823 is an apocalyptic number.

79977823 is a deficient number, since it is larger than the sum of its proper divisors (1).

79977823 is an equidigital number, since it uses as much as digits as its factorization.

79977823 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 52.

The square root of 79977823 is about 8943.0320920815. The cubic root of 79977823 is about 430.8471185782.

The spelling of 79977823 in words is "seventy-nine million, nine hundred seventy-seven thousand, eight hundred twenty-three".