136405 has 4 divisors (see below), whose sum is σ = 163692. Its totient is φ = 109120.

The previous prime is 136403. The next prime is 136417. The reversal of 136405 is 504631.

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

It can be written as a sum of positive squares in 2 ways, for example, as 77841 + 58564 = 279^2 + 242^2 .

It is not a de Polignac number, because 136405 - 2¹ = 136403 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 (136403) 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, 13636 + ... + 13645.

It is an arithmetic number, because the mean of its divisors is an integer number (40923).

2¹³⁶⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

136405 is a deficient number, since it is larger than the sum of its proper divisors (27287).

136405 is an equidigital number, since it uses as much as digits as its factorization.

136405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27286.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 136405 is about 369.3304753199. The cubic root of 136405 is about 51.4766287268.

The spelling of 136405 in words is "one hundred thirty-six thousand, four hundred five".