2013815 has 4 divisors (see below), whose sum is σ = 2416584. Its totient is φ = 1611048.

The previous prime is 2013787. The next prime is 2013821. The reversal of 2013815 is 5183102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5183102 = 2 ⋅2591551.

It is a cyclic number.

It is not a de Polignac number, because 2013815 - 2⁶ = 2013751 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 201377 + ... + 201386.

It is an arithmetic number, because the mean of its divisors is an integer number (604146).

2^2013815 is an apocalyptic number.

2013815 is a deficient number, since it is larger than the sum of its proper divisors (402769).

2013815 is an equidigital number, since it uses as much as digits as its factorization.

2013815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402768.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2013815 is about 1419.0894968253. The cubic root of 2013815 is about 126.2815364148.

Adding to 2013815 its reverse (5183102), we get a palindrome (7196917).

The spelling of 2013815 in words is "two million, thirteen thousand, eight hundred fifteen".