15699 has 4 divisors (see below), whose sum is σ = 20936. Its totient is φ = 10464.

The previous prime is 15683. The next prime is 15727. The reversal of 15699 is 99651.

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

It is not a de Polignac number, because 15699 - 2⁴ = 15683 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15619) 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, 2614 + ... + 2619.

It is an arithmetic number, because the mean of its divisors is an integer number (5234).

2¹⁵⁶⁹⁹ is an apocalyptic number.

15699 is a deficient number, since it is larger than the sum of its proper divisors (5237).

15699 is an equidigital number, since it uses as much as digits as its factorization.

15699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5236.

The product of its digits is 2430, while the sum is 30.

The square root of 15699 is about 125.2956503635. The cubic root of 15699 is about 25.0394045254.

The spelling of 15699 in words is "fifteen thousand, six hundred ninety-nine".