2015905 has 4 divisors (see below), whose sum is σ = 2419092. Its totient is φ = 1612720.

The previous prime is 2015879. The next prime is 2015921. The reversal of 2015905 is 5095102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1520289 + 495616 = 1233^2 + 704^2 .

It is not a de Polignac number, because 2015905 - 2⁵ = 2015873 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

2015905 is a lucky 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, 201586 + ... + 201595.

It is an arithmetic number, because the mean of its divisors is an integer number (604773).

2^2015905 is an apocalyptic number.

It is an amenable number.

2015905 is a deficient number, since it is larger than the sum of its proper divisors (403187).

2015905 is an equidigital number, since it uses as much as digits as its factorization.

2015905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403186.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 2015905 is about 1419.8256935272. The cubic root of 2015905 is about 126.3252076159.

The spelling of 2015905 in words is "two million, fifteen thousand, nine hundred five".