136138739 has 4 divisors (see below), whose sum is σ = 148515000. Its totient is φ = 123762480.

The previous prime is 136138733. The next prime is 136138753. The reversal of 136138739 is 937831631.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 136138739 - 2¹² = 136134643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 136138696 and 136138705.

It is not an unprimeable number, because it can be changed into a prime (136138733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6188114 + ... + 6188135.

It is an arithmetic number, because the mean of its divisors is an integer number (37128750).

Almost surely, 2^136138739 is an apocalyptic number.

136138739 is a deficient number, since it is larger than the sum of its proper divisors (12376261).

136138739 is a wasteful number, since it uses less digits than its factorization.

136138739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12376260.

The product of its digits is 81648, while the sum is 41.

The square root of 136138739 is about 11667.8506589689. The cubic root of 136138739 is about 514.4311297974.

The spelling of 136138739 in words is "one hundred thirty-six million, one hundred thirty-eight thousand, seven hundred thirty-nine".