2640856 has 16 divisors (see below), whose sum is σ = 5122800. Its totient is φ = 1274784.

The previous prime is 2640853. The next prime is 2640857. The reversal of 2640856 is 6580462.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5460 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (320175).

2^2640856 is an apocalyptic number.

It is an amenable number.

2640856 is a deficient number, since it is larger than the sum of its proper divisors (2481944).

2640856 is a wasteful number, since it uses less digits than its factorization.

2640856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11418 (or 11414 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 2640856 is about 1625.0710753687. The cubic root of 2640856 is about 138.2234006686.

The spelling of 2640856 in words is "two million, six hundred forty thousand, eight hundred fifty-six".