136239 has 4 divisors (see below), whose sum is σ = 181656. Its totient is φ = 90824.

The previous prime is 136237. The next prime is 136247. The reversal of 136239 is 932631.

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 136239 - 2¹ = 136237 is a prime.

It is a super-2 number, since 2×136239² = 37122130242, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136237) 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, 22704 + ... + 22709.

It is an arithmetic number, because the mean of its divisors is an integer number (45414).

2¹³⁶²³⁹ is an apocalyptic number.

136239 is a deficient number, since it is larger than the sum of its proper divisors (45417).

136239 is an equidigital number, since it uses as much as digits as its factorization.

136239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45416.

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

The square root of 136239 is about 369.1056759249. The cubic root of 136239 is about 51.4557385125.

The spelling of 136239 in words is "one hundred thirty-six thousand, two hundred thirty-nine".