2523640 has 32 divisors (see below), whose sum is σ = 6490080. Its totient is φ = 865152.

The previous prime is 2523593. The next prime is 2523641. The reversal of 2523640 is 463252.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2523641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4227 + ... + 4786.

It is an arithmetic number, because the mean of its divisors is an integer number (202815).

2^2523640 is an apocalyptic number.

2523640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2523640 is an abundant number, since it is smaller than the sum of its proper divisors (3966440).

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

2523640 is a wasteful number, since it uses less digits than its factorization.

2523640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9031 (or 9027 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 2523640 is about 1588.5968651612. The cubic root of 2523640 is about 136.1473316843.

Adding to 2523640 its reverse (463252), we get a palindrome (2986892).

The spelling of 2523640 in words is "two million, five hundred twenty-three thousand, six hundred forty".