2556738 has 32 divisors (see below), whose sum is σ = 5745600. Its totient is φ = 842688.

The previous prime is 2556713. The next prime is 2556739. The reversal of 2556738 is 8376552.

It is a d-powerful number, because it can be written as 2¹³ + 5 + 5⁹ + 6⁶ + 7⁵ + 3¹² + 8³ .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2556739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5893 + ... + 6311.

It is an arithmetic number, because the mean of its divisors is an integer number (179550).

2^2556738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2556738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2872800).

2556738 is an abundant number, since it is smaller than the sum of its proper divisors (3188862).

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

2556738 is a wasteful number, since it uses less digits than its factorization.

2556738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543 (or 537 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 2556738 is about 1598.9803000663. The cubic root of 2556738 is about 136.7399474801.

The spelling of 2556738 in words is "two million, five hundred fifty-six thousand, seven hundred thirty-eight".