236139 has 4 divisors (see below), whose sum is σ = 314856. Its totient is φ = 157424.

The previous prime is 236129. The next prime is 236143. The reversal of 236139 is 931632.

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

It is a cyclic number.

It is not a de Polignac number, because 236139 - 2⁵ = 236107 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (236129) 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 3 ways as a sum of consecutive naturals, for example, 39354 + ... + 39359.

It is an arithmetic number, because the mean of its divisors is an integer number (78714).

2²³⁶¹³⁹ is an apocalyptic number.

236139 is a deficient number, since it is larger than the sum of its proper divisors (78717).

236139 is an equidigital number, since it uses as much as digits as its factorization.

236139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78716.

The product of its digits is 972, while the sum is 24.

The square root of 236139 is about 485.9413544863. The cubic root of 236139 is about 61.8095962308.

The spelling of 236139 in words is "two hundred thirty-six thousand, one hundred thirty-nine".