77899 has 2 divisors, whose sum is σ = 77900. Its totient is φ = 77898.

The previous prime is 77893. The next prime is 77929. The reversal of 77899 is 99877.

It is a weak prime.

It is an emirp because it is prime and its reverse (99877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77899 - 2⁵ = 77867 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (77893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38949 + 38950.

It is an arithmetic number, because the mean of its divisors is an integer number (38950).

2⁷⁷⁸⁹⁹ is an apocalyptic number.

77899 is a deficient number, since it is larger than the sum of its proper divisors (1).

77899 is an equidigital number, since it uses as much as digits as its factorization.

77899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 40.

The square root of 77899 is about 279.1039232974. The cubic root of 77899 is about 42.7081370339.

The spelling of 77899 in words is "seventy-seven thousand, eight hundred ninety-nine".