18969 has 4 divisors (see below), whose sum is σ = 25296. Its totient is φ = 12644.

The previous prime is 18959. The next prime is 18973. The reversal of 18969 is 96981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96981 = 3 ⋅32327.

It is a cyclic number.

It is not a de Polignac number, because 18969 - 2⁸ = 18713 is a prime.

It is a super-2 number, since 2×18969² = 719645922, which contains 22 as substring.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

18969 is a lucky number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (18919) 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, 3159 + ... + 3164.

It is an arithmetic number, because the mean of its divisors is an integer number (6324).

2¹⁸⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

18969 is a deficient number, since it is larger than the sum of its proper divisors (6327).

18969 is an equidigital number, since it uses as much as digits as its factorization.

18969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6326.

The product of its digits is 3888, while the sum is 33.

The square root of 18969 is about 137.7279927974. The cubic root of 18969 is about 26.6694962275.

It can be divided in two parts, 189 and 69, that multiplied together give a triangular number (13041 = T₁₆₁).

The spelling of 18969 in words is "eighteen thousand, nine hundred sixty-nine".