99685 has 4 divisors (see below), whose sum is σ = 119628. Its totient is φ = 79744.

The previous prime is 99679. The next prime is 99689. The reversal of 99685 is 58699.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26244 + 73441 = 162^2 + 271^2 .

It is a cyclic number.

It is not a de Polignac number, because 99685 - 2⁹ = 99173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99689) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9964 + ... + 9973.

It is an arithmetic number, because the mean of its divisors is an integer number (29907).

2⁹⁹⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

99685 is a deficient number, since it is larger than the sum of its proper divisors (19943).

99685 is a wasteful number, since it uses less digits than its factorization.

99685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19942.

The product of its digits is 19440, while the sum is 37.

The square root of 99685 is about 315.7293144451. The cubic root of 99685 is about 46.3671003901.

It can be divided in two parts, 996 and 85, that added together give a triangular number (1081 = T₄₆).

The spelling of 99685 in words is "ninety-nine thousand, six hundred eighty-five".