2205540 has 36 divisors (see below), whose sum is σ = 6690684. Its totient is φ = 588096.

The previous prime is 2205527. The next prime is 2205547. The reversal of 2205540 is 455022.

It can be written as a sum of positive squares in 2 ways, for example, as 933156 + 1272384 = 966^2 + 1128^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (2205547) 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, 5947 + ... + 6306.

2^2205540 is an apocalyptic number.

2205540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2205540 is an abundant number, since it is smaller than the sum of its proper divisors (4485144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2205540 is a wasteful number, since it uses less digits than its factorization.

2205540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12268 (or 12263 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 2205540 is about 1485.1060568188. The cubic root of 2205540 is about 130.1682240336.

The spelling of 2205540 in words is "two million, two hundred five thousand, five hundred forty".