99659 has 8 divisors (see below), whose sum is σ = 119040. Its totient is φ = 81576.

The previous prime is 99643. The next prime is 99661. The reversal of 99659 is 95699.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99659 - 2⁴ = 99643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149 + ... + 470.

It is an arithmetic number, because the mean of its divisors is an integer number (14880).

2⁹⁹⁶⁵⁹ is an apocalyptic number.

99659 is a deficient number, since it is larger than the sum of its proper divisors (19381).

99659 is a wasteful number, since it uses less digits than its factorization.

99659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649.

The product of its digits is 21870, while the sum is 38.

The square root of 99659 is about 315.6881372494. The cubic root of 99659 is about 46.3630688593.

The spelling of 99659 in words is "ninety-nine thousand, six hundred fifty-nine".