2564843 has 2 divisors, whose sum is σ = 2564844. Its totient is φ = 2564842.

The previous prime is 2564831. The next prime is 2564857. The reversal of 2564843 is 3484652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2564843 - 2¹⁰ = 2563819 is a prime.

It is a super-2 number, since 2×2564843² = 13156839229298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2564813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1282421 + 1282422.

It is an arithmetic number, because the mean of its divisors is an integer number (1282422).

2^2564843 is an apocalyptic number.

2564843 is a deficient number, since it is larger than the sum of its proper divisors (1).

2564843 is an equidigital number, since it uses as much as digits as its factorization.

2564843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 32.

The square root of 2564843 is about 1601.5127223972. The cubic root of 2564843 is about 136.8842861169.

The spelling of 2564843 in words is "two million, five hundred sixty-four thousand, eight hundred forty-three".