77999423 has 2 divisors, whose sum is σ = 77999424. Its totient is φ = 77999422.

The previous prime is 77999399. The next prime is 77999477. The reversal of 77999423 is 32499977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77999423 - 2⁶ = 77999359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77999483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38999711 + 38999712.

It is an arithmetic number, because the mean of its divisors is an integer number (38999712).

Almost surely, 2^77999423 is an apocalyptic number.

77999423 is a deficient number, since it is larger than the sum of its proper divisors (1).

77999423 is an equidigital number, since it uses as much as digits as its factorization.

77999423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 50.

The square root of 77999423 is about 8831.7282000750. The cubic root of 77999423 is about 427.2648146099.

The spelling of 77999423 in words is "seventy-seven million, nine hundred ninety-nine thousand, four hundred twenty-three".