235989 has 12 divisors (see below), whose sum is σ = 367276. Its totient is φ = 145152.

The previous prime is 235979. The next prime is 235997. The reversal of 235989 is 989532.

It can be written as a sum of positive squares in 2 ways, for example, as 116964 + 119025 = 342^2 + 345^2 .

It is not a de Polignac number, because 235989 - 2¹¹ = 233941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (235919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 892 + ... + 1125.

2²³⁵⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

235989 is a deficient number, since it is larger than the sum of its proper divisors (131287).

235989 is a wasteful number, since it uses less digits than its factorization.

235989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2036 (or 2033 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 235989 is about 485.7869903569. The cubic root of 235989 is about 61.7965059136.

The spelling of 235989 in words is "two hundred thirty-five thousand, nine hundred eighty-nine".