2125665 has 12 divisors (see below), whose sum is σ = 3684564. Its totient is φ = 1133664.

The previous prime is 2125661. The next prime is 2125679. The reversal of 2125665 is 5665212.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 1846881 = 528^2 + 1359^2 .

It is not a de Polignac number, because 2125665 - 2² = 2125661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2125661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23574 + ... + 23663.

It is an arithmetic number, because the mean of its divisors is an integer number (307047).

2^2125665 is an apocalyptic number.

It is an amenable number.

2125665 is a deficient number, since it is larger than the sum of its proper divisors (1558899).

2125665 is a wasteful number, since it uses less digits than its factorization.

2125665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47248 (or 47245 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 2125665 is about 1457.9660489874. The cubic root of 2125665 is about 128.5774891323.

It can be divided in two parts, 21256 and 65, that added together give a triangular number (21321 = T₂₀₆).

The spelling of 2125665 in words is "two million, one hundred twenty-five thousand, six hundred sixty-five".