19899 has 16 divisors (see below), whose sum is σ = 32640. Its totient is φ = 11880.

The previous prime is 19891. The next prime is 19913. The reversal of 19899 is 99891.

It is not a de Polignac number, because 19899 - 2³ = 19891 is a prime.

Its product of digits (5832) is a multiple of the sum of its prime divisors (81).

It is not an unprimeable number, because it can be changed into a prime (19891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264 + ... + 330.

It is an arithmetic number, because the mean of its divisors is an integer number (2040).

2¹⁹⁸⁹⁹ is an apocalyptic number.

19899 is a deficient number, since it is larger than the sum of its proper divisors (12741).

19899 is a wasteful number, since it uses less digits than its factorization.

19899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 81 counting only the distinct ones).

The product of its digits is 5832, while the sum is 36.

The square root of 19899 is about 141.0638153461. The cubic root of 19899 is about 27.0984063368.

The spelling of 19899 in words is "nineteen thousand, eight hundred ninety-nine".