2126665 has 4 divisors (see below), whose sum is σ = 2552004. Its totient is φ = 1701328.

The previous prime is 2126659. The next prime is 2126681. The reversal of 2126665 is 5666212.

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 1468944 + 657721 = 1212^2 + 811^2 .

It is a cyclic number.

It is not a de Polignac number, because 2126665 - 2⁵ = 2126633 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, 212662 + ... + 212671.

It is an arithmetic number, because the mean of its divisors is an integer number (638001).

2^2126665 is an apocalyptic number.

It is an amenable number.

2126665 is a deficient number, since it is larger than the sum of its proper divisors (425339).

2126665 is an equidigital number, since it uses as much as digits as its factorization.

2126665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425338.

The product of its digits is 4320, while the sum is 28.

The square root of 2126665 is about 1458.3089521771. The cubic root of 2126665 is about 128.5976486795.

The spelling of 2126665 in words is "two million, one hundred twenty-six thousand, six hundred sixty-five".