136209939 has 16 divisors (see below), whose sum is σ = 191837184. Its totient is φ = 85831200.

The previous prime is 136209907. The next prime is 136209949. The reversal of 136209939 is 939902631.

It is a happy number.

It is not a de Polignac number, because 136209939 - 2⁵ = 136209907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 136209939.

It is not an unprimeable number, because it can be changed into a prime (136209949) 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, 13032 + ... + 21029.

It is an arithmetic number, because the mean of its divisors is an integer number (11989824).

Almost surely, 2^136209939 is an apocalyptic number.

136209939 is a deficient number, since it is larger than the sum of its proper divisors (55627245).

136209939 is a wasteful number, since it uses less digits than its factorization.

136209939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34138.

The product of its (nonzero) digits is 78732, while the sum is 42.

The square root of 136209939 is about 11670.9013790709. The cubic root of 136209939 is about 514.5207959552.

The spelling of 136209939 in words is "one hundred thirty-six million, two hundred nine thousand, nine hundred thirty-nine".