33989 has 4 divisors (see below), whose sum is σ = 34860. Its totient is φ = 33120.

The previous prime is 33967. The next prime is 33997. The reversal of 33989 is 98933.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9025 + 24964 = 95^2 + 158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33289) 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, 374 + ... + 455.

It is an arithmetic number, because the mean of its divisors is an integer number (8715).

2³³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

33989 is a deficient number, since it is larger than the sum of its proper divisors (871).

33989 is an equidigital number, since it uses as much as digits as its factorization.

33989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870.

The product of its digits is 5832, while the sum is 32.

The square root of 33989 is about 184.3610587950. The cubic root of 33989 is about 32.3926239369.

The spelling of 33989 in words is "thirty-three thousand, nine hundred eighty-nine".