136686409 has 16 divisors (see below), whose sum is σ = 149990400. Its totient is φ = 124001280.

The previous prime is 136686391. The next prime is 136686413. The reversal of 136686409 is 904686631.

It is a cyclic number.

It is not a de Polignac number, because 136686409 - 2⁷ = 136686281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136686419) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 227892 + ... + 228490.

It is an arithmetic number, because the mean of its divisors is an integer number (9374400).

Almost surely, 2^136686409 is an apocalyptic number.

It is an amenable number.

136686409 is a deficient number, since it is larger than the sum of its proper divisors (13303991).

136686409 is a wasteful number, since it uses less digits than its factorization.

136686409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 136686409 is about 11691.2962925417. The cubic root of 136686409 is about 515.1200386288.

The spelling of 136686409 in words is "one hundred thirty-six million, six hundred eighty-six thousand, four hundred nine".