2815138 has 4 divisors (see below), whose sum is σ = 4222710. Its totient is φ = 1407568.

The previous prime is 2815129. The next prime is 2815157. The reversal of 2815138 is 8315182.

2815138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8315182 = 2 ⋅4157591.

It can be written as a sum of positive squares in only one way, i.e., 2812329 + 2809 = 1677^2 + 53^2 .

It is an Ulam 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 as a sum of consecutive naturals, namely, 703783 + ... + 703786.

2^2815138 is an apocalyptic number.

2815138 is a deficient number, since it is larger than the sum of its proper divisors (1407572).

2815138 is a wasteful number, since it uses less digits than its factorization.

2815138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407571.

The product of its digits is 1920, while the sum is 28.

The square root of 2815138 is about 1677.8372984291. The cubic root of 2815138 is about 141.1995230398.

The spelling of 2815138 in words is "two million, eight hundred fifteen thousand, one hundred thirty-eight".