233989 has 4 divisors (see below), whose sum is σ = 267424. Its totient is φ = 200556.

The previous prime is 233983. The next prime is 233993. The reversal of 233989 is 989332.

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.

It is a cyclic number.

It is not a de Polignac number, because 233989 - 2⁷ = 233861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (233983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16707 + ... + 16720.

It is an arithmetic number, because the mean of its divisors is an integer number (66856).

2²³³⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

233989 is a deficient number, since it is larger than the sum of its proper divisors (33435).

233989 is an equidigital number, since it uses as much as digits as its factorization.

233989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33434.

The product of its digits is 11664, while the sum is 34.

The square root of 233989 is about 483.7240949136. The cubic root of 233989 is about 61.6214358692.

The spelling of 233989 in words is "two hundred thirty-three thousand, nine hundred eighty-nine".