138179915 has 8 divisors (see below), whose sum is σ = 166214160. Its totient is φ = 110278432.

The previous prime is 138179879. The next prime is 138179917. The reversal of 138179915 is 519971831.

138179915 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 138179915 - 2⁸ = 138179659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138179917) 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, 30884 + ... + 35073.

It is an arithmetic number, because the mean of its divisors is an integer number (20776770).

Almost surely, 2^138179915 is an apocalyptic number.

138179915 is a deficient number, since it is larger than the sum of its proper divisors (28034245).

138179915 is an equidigital number, since it uses as much as digits as its factorization.

138179915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66381.

The product of its digits is 68040, while the sum is 44.

The square root of 138179915 is about 11754.9953211390. The cubic root of 138179915 is about 516.9894020153.

It can be divided in two parts, 13817 and 9915, that added together give a palindrome (23732).

The spelling of 138179915 in words is "one hundred thirty-eight million, one hundred seventy-nine thousand, nine hundred fifteen".