2543740 has 24 divisors (see below), whose sum is σ = 5377680. Its totient is φ = 1010688.

The previous prime is 2543729. The next prime is 2543747. The reversal of 2543740 is 473452.

2543740 = T₅₆ + T₅₇ + ... + T₂₄₈.

2543740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2543740² = 12941226375200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2543747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3531 + ... + 4189.

It is an arithmetic number, because the mean of its divisors is an integer number (224070).

2^2543740 is an apocalyptic number.

2543740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2543740 is an abundant number, since it is smaller than the sum of its proper divisors (2833940).

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

2543740 is a wasteful number, since it uses less digits than its factorization.

2543740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 25.

The square root of 2543740 is about 1594.9106558049. The cubic root of 2543740 is about 136.5078331902.

The spelling of 2543740 in words is "two million, five hundred forty-three thousand, seven hundred forty".