2581240 has 32 divisors (see below), whose sum is σ = 5935680. Its totient is φ = 1009792.

The previous prime is 2581223. The next prime is 2581253. The reversal of 2581240 is 421852.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194 + ... + 2566.

It is an arithmetic number, because the mean of its divisors is an integer number (185490).

2^2581240 is an apocalyptic number.

2581240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2581240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2967840).

2581240 is an abundant number, since it is smaller than the sum of its proper divisors (3354440).

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

2581240 is a wasteful number, since it uses less digits than its factorization.

2581240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 2581240 is about 1606.6237891927. The cubic root of 2581240 is about 137.1753663838.

It can be divided in two parts, 25812 and 40, that added together give a palindrome (25852).

The spelling of 2581240 in words is "two million, five hundred eighty-one thousand, two hundred forty".