138188513 has 8 divisors (see below), whose sum is σ = 139003776. Its totient is φ = 137376400.

The previous prime is 138188473. The next prime is 138188521. The reversal of 138188513 is 315881831.

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 138188513 - 2²⁶ = 71079649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138188593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211295 + ... + 211947.

It is an arithmetic number, because the mean of its divisors is an integer number (17375472).

Almost surely, 2^138188513 is an apocalyptic number.

It is an amenable number.

138188513 is a deficient number, since it is larger than the sum of its proper divisors (815263).

138188513 is an equidigital number, since it uses as much as digits as its factorization.

138188513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575.

The product of its digits is 23040, while the sum is 38.

The square root of 138188513 is about 11755.3610323120. The cubic root of 138188513 is about 517.0001247089. Note that the first 3 decimals are identical.

The spelling of 138188513 in words is "one hundred thirty-eight million, one hundred eighty-eight thousand, five hundred thirteen".