2563540 has 24 divisors (see below), whose sum is σ = 6152832. Its totient is φ = 878880.

The previous prime is 2563523. The next prime is 2563543. The reversal of 2563540 is 453652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563543) 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, 9016 + ... + 9295.

It is an arithmetic number, because the mean of its divisors is an integer number (256368).

2^2563540 is an apocalyptic number.

2563540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2563540 is an abundant number, since it is smaller than the sum of its proper divisors (3589292).

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

2563540 is a wasteful number, since it uses less digits than its factorization.

2563540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18327 (or 18325 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 2563540 is about 1601.1058678301. The cubic root of 2563540 is about 136.8611020549.

The spelling of 2563540 in words is "two million, five hundred sixty-three thousand, five hundred forty".