138758659 has 4 divisors (see below), whose sum is σ = 149432416. Its totient is φ = 128084904.

The previous prime is 138758651. The next prime is 138758671. The reversal of 138758659 is 956857831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 956857831 = 4603 ⋅207877.

It is a cyclic number.

It is not a de Polignac number, because 138758659 - 2³ = 138758651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138758651) 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, 5336859 + ... + 5336884.

It is an arithmetic number, because the mean of its divisors is an integer number (37358104).

Almost surely, 2^138758659 is an apocalyptic number.

138758659 is a deficient number, since it is larger than the sum of its proper divisors (10673757).

138758659 is a wasteful number, since it uses less digits than its factorization.

138758659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673756.

The product of its digits is 1814400, while the sum is 52.

The square root of 138758659 is about 11779.5865377355. The cubic root of 138758659 is about 517.7101718915.

The spelling of 138758659 in words is "one hundred thirty-eight million, seven hundred fifty-eight thousand, six hundred fifty-nine".