2543240 has 64 divisors (see below), whose sum is σ = 6773760. Its totient is φ = 840960.

The previous prime is 2543239. The next prime is 2543249. The reversal of 2543240 is 423452.

2543240 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a d-powerful number, because it can be written as 2⁵ + 5⁹ + 4² + 3⁵ + 2¹⁹ + 4⁸ + 0 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543249) 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, 8534 + ... + 8826.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2^2543240 is an apocalyptic number.

2543240 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 2543240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3386880).

2543240 is an abundant number, since it is smaller than the sum of its proper divisors (4230520).

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

2543240 is a wasteful number, since it uses less digits than its factorization.

2543240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 2543240 is about 1594.7538995093. The cubic root of 2543240 is about 136.4988885668.

Adding to 2543240 its reverse (423452), we get a palindrome (2966692).

The spelling of 2543240 in words is "two million, five hundred forty-three thousand, two hundred forty".