2255640 has 32 divisors (see below), whose sum is σ = 6767280. Its totient is φ = 601472.

The previous prime is 2255639. The next prime is 2255657. The reversal of 2255640 is 465522.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 2255640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9279 + ... + 9518.

2^2255640 is an apocalyptic number.

2255640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2255640 is an abundant number, since it is smaller than the sum of its proper divisors (4511640).

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

2255640 is a wasteful number, since it uses less digits than its factorization.

2255640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18811 (or 18807 counting only the distinct ones).

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

The square root of 2255640 is about 1501.8788233410. The cubic root of 2255640 is about 131.1464671053.

The spelling of 2255640 in words is "two million, two hundred fifty-five thousand, six hundred forty".