2122865 has 4 divisors (see below), whose sum is σ = 2547444. Its totient is φ = 1698288.

The previous prime is 2122859. The next prime is 2122873. The reversal of 2122865 is 5682212.

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 758641 + 1364224 = 871^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 2122865 - 2¹⁰ = 2121841 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, 212282 + ... + 212291.

It is an arithmetic number, because the mean of its divisors is an integer number (636861).

2^2122865 is an apocalyptic number.

It is an amenable number.

2122865 is a deficient number, since it is larger than the sum of its proper divisors (424579).

2122865 is an equidigital number, since it uses as much as digits as its factorization.

2122865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424578.

The product of its digits is 1920, while the sum is 26.

The square root of 2122865 is about 1457.0054907240. The cubic root of 2122865 is about 128.5210087429.

The spelling of 2122865 in words is "two million, one hundred twenty-two thousand, eight hundred sixty-five".