19995 has 16 divisors (see below), whose sum is σ = 33792. Its totient is φ = 10080.

The previous prime is 19993. The next prime is 19997. The reversal of 19995 is 59991.

19995 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

19995 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is an interprime number because it is at equal distance from previous prime (19993) and next prime (19997).

It is not a de Polignac number, because 19995 - 2¹ = 19993 is a prime.

19995 is an undulating number in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19991) 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, 444 + ... + 486.

It is an arithmetic number, because the mean of its divisors is an integer number (2112).

2¹⁹⁹⁹⁵ is an apocalyptic number.

19995 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19995 is a deficient number, since it is larger than the sum of its proper divisors (13797).

19995 is a wasteful number, since it uses less digits than its factorization.

19995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82.

The product of its digits is 3645, while the sum is 33.

The square root of 19995 is about 141.4036774628. The cubic root of 19995 is about 27.1419139627.

The spelling of 19995 in words is "nineteen thousand, nine hundred ninety-five".