2042665 has 4 divisors (see below), whose sum is σ = 2451204. Its totient is φ = 1634128.

The previous prime is 2042657. The next prime is 2042681. The reversal of 2042665 is 5662402.

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 817216 + 1225449 = 904^2 + 1107^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042665 - 2³ = 2042657 is a prime.

It is a Duffinian 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, 204262 + ... + 204271.

It is an arithmetic number, because the mean of its divisors is an integer number (612801).

2^2042665 is an apocalyptic number.

It is an amenable number.

2042665 is a deficient number, since it is larger than the sum of its proper divisors (408539).

2042665 is an equidigital number, since it uses as much as digits as its factorization.

2042665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408538.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 2042665 is about 1429.2183178227. The cubic root of 2042665 is about 126.8817176347.

The spelling of 2042665 in words is "two million, forty-two thousand, six hundred sixty-five".