136439 has 8 divisors (see below), whose sum is σ = 147840. Its totient is φ = 125496.

The previous prime is 136429. The next prime is 136447. The reversal of 136439 is 934631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-136439 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 136439.

It is not an unprimeable number, because it can be changed into a prime (136429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734 + ... + 900.

It is an arithmetic number, because the mean of its divisors is an integer number (18480).

2¹³⁶⁴³⁹ is an apocalyptic number.

136439 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

136439 is a deficient number, since it is larger than the sum of its proper divisors (11401).

136439 is a wasteful number, since it uses less digits than its factorization.

136439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229.

The product of its digits is 1944, while the sum is 26.

The square root of 136439 is about 369.3765016890. The cubic root of 136439 is about 51.4809053540.

It can be divided in two parts, 136 and 439, that added together give a palindrome (575).

The spelling of 136439 in words is "one hundred thirty-six thousand, four hundred thirty-nine".