99879 has 12 divisors (see below), whose sum is σ = 144936. Its totient is φ = 61152.

The previous prime is 99877. The next prime is 99881. The reversal of 99879 is 97899.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99877) and next prime (99881).

It is not a de Polignac number, because 99879 - 2¹ = 99877 is a prime.

99879 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 99879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99871) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 409 + ... + 605.

It is an arithmetic number, because the mean of its divisors is an integer number (12078).

2⁹⁹⁸⁷⁹ is an apocalyptic number.

99879 is a deficient number, since it is larger than the sum of its proper divisors (45057).

99879 is a wasteful number, since it uses less digits than its factorization.

99879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 213 counting only the distinct ones).

The product of its digits is 40824, while the sum is 42.

The square root of 99879 is about 316.0363903097. The cubic root of 99879 is about 46.3971597053.

The spelling of 99879 in words is "ninety-nine thousand, eight hundred seventy-nine".