2564243 has 4 divisors (see below), whose sum is σ = 2797368. Its totient is φ = 2331120.

The previous prime is 2564207. The next prime is 2564249. The reversal of 2564243 is 3424652.

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

It is not a de Polignac number, because 2564243 - 2¹² = 2560147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2564249) 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, 116546 + ... + 116567.

It is an arithmetic number, because the mean of its divisors is an integer number (699342).

2^2564243 is an apocalyptic number.

2564243 is a deficient number, since it is larger than the sum of its proper divisors (233125).

2564243 is a wasteful number, since it uses less digits than its factorization.

2564243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233124.

The product of its digits is 5760, while the sum is 26.

The square root of 2564243 is about 1601.3253885454. The cubic root of 2564243 is about 136.8736113924.

Adding to 2564243 its reverse (3424652), we get a palindrome (5988895).

The spelling of 2564243 in words is "two million, five hundred sixty-four thousand, two hundred forty-three".