2205645 has 16 divisors (see below), whose sum is σ = 3800832. Its totient is φ = 1085760.

The previous prime is 2205629. The next prime is 2205649. The reversal of 2205645 is 5465022.

It is not a de Polignac number, because 2205645 - 2⁴ = 2205629 is a prime.

It is a super-3 number, since 3×2205645³ = 32190527686946133375, which contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2205649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5461 + ... + 5850.

It is an arithmetic number, because the mean of its divisors is an integer number (237552).

2^2205645 is an apocalyptic number.

It is an amenable number.

2205645 is a deficient number, since it is larger than the sum of its proper divisors (1595187).

2205645 is a wasteful number, since it uses less digits than its factorization.

2205645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11332.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 2205645 is about 1485.1414074087. The cubic root of 2205645 is about 130.1702896572.

It can be divided in two parts, 2205 and 645, that added together give a triangular number (2850 = T₇₅).

The spelling of 2205645 in words is "two million, two hundred five thousand, six hundred forty-five".