2045815 has 4 divisors (see below), whose sum is σ = 2454984. Its totient is φ = 1636648.

The previous prime is 2045789. The next prime is 2045819. The reversal of 2045815 is 5185402.

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

It is a cyclic number.

It is not a de Polignac number, because 2045815 - 2¹⁷ = 1914743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2045815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2045819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204577 + ... + 204586.

It is an arithmetic number, because the mean of its divisors is an integer number (613746).

2^2045815 is an apocalyptic number.

2045815 is a deficient number, since it is larger than the sum of its proper divisors (409169).

2045815 is an equidigital number, since it uses as much as digits as its factorization.

2045815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409168.

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 2045815 is about 1430.3198942894. The cubic root of 2045815 is about 126.9469057001.

The spelling of 2045815 in words is "two million, forty-five thousand, eight hundred fifteen".