2556918 has 72 divisors (see below), whose sum is σ = 6971328. Its totient is φ = 671328.

The previous prime is 2556913. The next prime is 2556943. The reversal of 2556918 is 8196552.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2556913) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11355 + ... + 11577.

It is an arithmetic number, because the mean of its divisors is an integer number (96824).

2^2556918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2556918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3485664).

2556918 is an abundant number, since it is smaller than the sum of its proper divisors (4414410).

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

2556918 is a wasteful number, since it uses less digits than its factorization.

2556918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258 (or 248 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 2556918 is about 1599.0365849473. The cubic root of 2556918 is about 136.7431563362.

The spelling of 2556918 in words is "two million, five hundred fifty-six thousand, nine hundred eighteen".