136842909 has 32 divisors (see below), whose sum is σ = 221579520. Its totient is φ = 73446912.

The previous prime is 136842907. The next prime is 136842913. The reversal of 136842909 is 909248631.

It is not a de Polignac number, because 136842909 - 2¹ = 136842907 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136842907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19497 + ... + 25569.

It is an arithmetic number, because the mean of its divisors is an integer number (6924360).

Almost surely, 2^136842909 is an apocalyptic number.

It is an amenable number.

136842909 is a deficient number, since it is larger than the sum of its proper divisors (84736611).

136842909 is a wasteful number, since it uses less digits than its factorization.

136842909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6149.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 136842909 is about 11697.9873910002. The cubic root of 136842909 is about 515.3165603332.

The spelling of 136842909 in words is "one hundred thirty-six million, eight hundred forty-two thousand, nine hundred nine".