2505645 has 12 divisors (see below), whose sum is σ = 4343196. Its totient is φ = 1336320.

The previous prime is 2505641. The next prime is 2505673. The reversal of 2505645 is 5465052.

It can be written as a sum of positive squares in 2 ways, for example, as 1022121 + 1483524 = 1011^2 + 1218^2 .

It is not a de Polignac number, because 2505645 - 2² = 2505641 is a prime.

It is a super-3 number, since 3×2505645³ = 47193248775213633375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2505641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27796 + ... + 27885.

It is an arithmetic number, because the mean of its divisors is an integer number (361933).

2^2505645 is an apocalyptic number.

It is an amenable number.

2505645 is a deficient number, since it is larger than the sum of its proper divisors (1837551).

2505645 is a wasteful number, since it uses less digits than its factorization.

2505645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55692 (or 55689 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 2505645 is about 1582.9229292672. The cubic root of 2505645 is about 135.8229566222.

The spelling of 2505645 in words is "two million, five hundred five thousand, six hundred forty-five".