136438939 has 48 divisors (see below), whose sum is σ = 180774720. Its totient is φ = 100638720.

The previous prime is 136438927. The next prime is 136438961. The reversal of 136438939 is 939834631.

It is not a de Polignac number, because 136438939 - 2⁷ = 136438811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136438909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1406539 + ... + 1406635.

It is an arithmetic number, because the mean of its divisors is an integer number (3766140).

Almost surely, 2^136438939 is an apocalyptic number.

136438939 is a deficient number, since it is larger than the sum of its proper divisors (44335781).

136438939 is a wasteful number, since it uses less digits than its factorization.

136438939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200 (or 187 counting only the distinct ones).

The product of its digits is 419904, while the sum is 46.

The square root of 136438939 is about 11680.7079836798. The cubic root of 136438939 is about 514.8089768186.

The spelling of 136438939 in words is "one hundred thirty-six million, four hundred thirty-eight thousand, nine hundred thirty-nine".