138135649 has 8 divisors (see below), whose sum is σ = 140919912. Its totient is φ = 135358080.

The previous prime is 138135619. The next prime is 138135667. The reversal of 138135649 is 946531831.

It can be written as a sum of positive squares in 4 ways, for example, as 45360225 + 92775424 = 6735^2 + 9632^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138135649 - 2⁵ = 138135617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138135619) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69027 + ... + 70999.

It is an arithmetic number, because the mean of its divisors is an integer number (17614989).

Almost surely, 2^138135649 is an apocalyptic number.

It is an amenable number.

138135649 is a deficient number, since it is larger than the sum of its proper divisors (2784263).

138135649 is a wasteful number, since it uses less digits than its factorization.

138135649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347.

The product of its digits is 77760, while the sum is 40.

The square root of 138135649 is about 11753.1123112136. The cubic root of 138135649 is about 516.9341901874.

The spelling of 138135649 in words is "one hundred thirty-eight million, one hundred thirty-five thousand, six hundred forty-nine".