236989 has 4 divisors (see below), whose sum is σ = 238140. Its totient is φ = 235840.

The previous prime is 236983. The next prime is 236993. The reversal of 236989 is 989632.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 27225 + 209764 = 165^2 + 458^2 .

It is a cyclic number.

It is not a de Polignac number, because 236989 - 2³ = 236981 is a prime.

It is a super-2 number, since 2×236989² = 112327572242, which contains 22 as substring.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (236981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (59535).

2²³⁶⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

236989 is a deficient number, since it is larger than the sum of its proper divisors (1151).

236989 is an equidigital number, since it uses as much as digits as its factorization.

236989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1150.

The product of its digits is 23328, while the sum is 37.

The square root of 236989 is about 486.8151599940. The cubic root of 236989 is about 61.8836701791.

It can be divided in two parts, 236 and 989, that added together give a triangular number (1225 = T₄₉).

The spelling of 236989 in words is "two hundred thirty-six thousand, nine hundred eighty-nine".