138748715 has 32 divisors (see below), whose sum is σ = 201277440. Its totient is φ = 89798400.

The previous prime is 138748711. The next prime is 138748723. The reversal of 138748715 is 517847831.

It is not a de Polignac number, because 138748715 - 2² = 138748711 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138748711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42926 + ... + 46044.

It is an arithmetic number, because the mean of its divisors is an integer number (6289920).

Almost surely, 2^138748715 is an apocalyptic number.

138748715 is a deficient number, since it is larger than the sum of its proper divisors (62528725).

138748715 is a wasteful number, since it uses less digits than its factorization.

138748715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203.

The product of its digits is 188160, while the sum is 44.

The square root of 138748715 is about 11779.1644440512. The cubic root of 138748715 is about 517.6978045361.

The spelling of 138748715 in words is "one hundred thirty-eight million, seven hundred forty-eight thousand, seven hundred fifteen".