15996 has 24 divisors (see below), whose sum is σ = 39424. Its totient is φ = 5040.

The previous prime is 15991. The next prime is 16001. The reversal of 15996 is 69951.

It is an interprime number because it is at equal distance from previous prime (15991) and next prime (16001).

15996 is an undulating number in base 6.

Its product of digits (2430) is a multiple of the sum of its prime factors (81).

It is a nialpdrome in base 7 and base 12.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15991) by changing a digit.

15996 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 351 + ... + 393.

2¹⁵⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

15996 is an abundant number, since it is smaller than the sum of its proper divisors (23428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19712).

15996 is a wasteful number, since it uses less digits than its factorization.

15996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 79 counting only the distinct ones).

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

The square root of 15996 is about 126.4752940301. The cubic root of 15996 is about 25.1963209545.

The spelling of 15996 in words is "fifteen thousand, nine hundred ninety-six".