8138915 has 4 divisors (see below), whose sum is σ = 9766704. Its totient is φ = 6511128.

The previous prime is 8138909. The next prime is 8138947. The reversal of 8138915 is 5198318.

8138915 is nontrivially palindromic in base 14.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8138915 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 813887 + ... + 813896.

It is an arithmetic number, because the mean of its divisors is an integer number (2441676).

Almost surely, 2^8138915 is an apocalyptic number.

8138915 is a deficient number, since it is larger than the sum of its proper divisors (1627789).

8138915 is a wasteful number, since it uses less digits than its factorization.

8138915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627788.

The product of its digits is 8640, while the sum is 35.

The square root of 8138915 is about 2852.8783710491. The cubic root of 8138915 is about 201.1509884216.

The spelling of 8138915 in words is "eight million, one hundred thirty-eight thousand, nine hundred fifteen".