136823 has 4 divisors (see below), whose sum is σ = 139128. Its totient is φ = 134520.

The previous prime is 136813. The next prime is 136841. The reversal of 136823 is 328631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328631 = 31 ⋅10601.

It is a cyclic number.

It is not a de Polignac number, because 136823 - 2¹⁰ = 135799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136813) 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, 1061 + ... + 1182.

It is an arithmetic number, because the mean of its divisors is an integer number (34782).

2¹³⁶⁸²³ is an apocalyptic number.

136823 is a deficient number, since it is larger than the sum of its proper divisors (2305).

136823 is an equidigital number, since it uses as much as digits as its factorization.

136823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304.

The product of its digits is 864, while the sum is 23.

The square root of 136823 is about 369.8959313104. The cubic root of 136823 is about 51.5291568331.

It can be divided in two parts, 136 and 823, that added together give a palindrome (959).

The spelling of 136823 in words is "one hundred thirty-six thousand, eight hundred twenty-three".