2656540 has 24 divisors (see below), whose sum is σ = 5710320. Its totient is φ = 1037568.

The previous prime is 2656529. The next prime is 2656547. The reversal of 2656540 is 456562.

2656540 = T₁₃₅ + T₁₃₆ + ... + T₂₆₃.

It is a junction number, because it is equal to n+sod(n) for n = 2656499 and 2656508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2656547) 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, 685 + ... + 2404.

It is an arithmetic number, because the mean of its divisors is an integer number (237930).

2^2656540 is an apocalyptic number.

2656540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2656540 is an abundant number, since it is smaller than the sum of its proper divisors (3053780).

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

2656540 is a wasteful number, since it uses less digits than its factorization.

2656540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3141 (or 3139 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 2656540 is about 1629.8895668112. The cubic root of 2656540 is about 138.4964962383.

The spelling of 2656540 in words is "two million, six hundred fifty-six thousand, five hundred forty".