136388239 has 12 divisors (see below), whose sum is σ = 150483096. Its totient is φ = 123513312.

The previous prime is 136388237. The next prime is 136388249. The reversal of 136388239 is 932883631.

It is not a de Polignac number, because 136388239 - 2¹ = 136388237 is a prime.

It is a super-2 number, since 2×136388239² = 37203503475042242, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136388195 and 136388204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136388237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1344 + ... + 16570.

It is an arithmetic number, because the mean of its divisors is an integer number (12540258).

Almost surely, 2^136388239 is an apocalyptic number.

136388239 is a deficient number, since it is larger than the sum of its proper divisors (14094857).

136388239 is a wasteful number, since it uses less digits than its factorization.

136388239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15306 (or 15293 counting only the distinct ones).

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

The square root of 136388239 is about 11678.5375368665. The cubic root of 136388239 is about 514.7452021392.

The spelling of 136388239 in words is "one hundred thirty-six million, three hundred eighty-eight thousand, two hundred thirty-nine".