138518613 has 16 divisors (see below), whose sum is σ = 206366400. Its totient is φ = 91826640.

The previous prime is 138518603. The next prime is 138518641. The reversal of 138518613 is 316815831.

138518613 is a `hidden beast` number, since 1 + 38 + 5 + 1 + 8 + 613 = 666.

It is not a de Polignac number, because 138518613 - 2⁹ = 138518101 is a prime.

It is a super-2 number, since 2×138518613² = 38374812294887538, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138518603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9498 + ... + 19163.

It is an arithmetic number, because the mean of its divisors is an integer number (12897900).

Almost surely, 2^138518613 is an apocalyptic number.

It is an amenable number.

138518613 is a deficient number, since it is larger than the sum of its proper divisors (67847787).

138518613 is a wasteful number, since it uses less digits than its factorization.

138518613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28849 (or 28843 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 138518613 is about 11769.3930599670. The cubic root of 138518613 is about 517.4114614334.

The spelling of 138518613 in words is "one hundred thirty-eight million, five hundred eighteen thousand, six hundred thirteen".