2543993 has 4 divisors (see below), whose sum is σ = 2548980. Its totient is φ = 2539008.

The previous prime is 2543971. The next prime is 2544011. The reversal of 2543993 is 3993452.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1517824 + 1026169 = 1232^2 + 1013^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2543993 is a prime.

It is a d-powerful number, because it can be written as 2⁵ + 5⁹ + 4⁴ + 3¹⁰ + 9 + 9² + 3¹² .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2543963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1628 + ... + 2781.

It is an arithmetic number, because the mean of its divisors is an integer number (637245).

2^2543993 is an apocalyptic number.

It is an amenable number.

2543993 is a deficient number, since it is larger than the sum of its proper divisors (4987).

2543993 is an equidigital number, since it uses as much as digits as its factorization.

2543993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4986.

The product of its digits is 29160, while the sum is 35.

The square root of 2543993 is about 1594.9899686205. The cubic root of 2543993 is about 136.5123587230.

The spelling of 2543993 in words is "two million, five hundred forty-three thousand, nine hundred ninety-three".