2565243 has 8 divisors (see below), whose sum is σ = 3800400. Its totient is φ = 1710144.

The previous prime is 2565239. The next prime is 2565257. The reversal of 2565243 is 3425652.

2565243 is a `hidden beast` number, since 2 + 5 + 652 + 4 + 3 = 666.

It is not a de Polignac number, because 2565243 - 2² = 2565239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 95009 = 2565243 / (2 + 5 + 6 + 5 + 2 + 4 + 3).

It is a d-powerful number, because it can be written as 2⁵ + 5⁷ + 6³ + 5⁹ + 2¹¹ + 4⁴ + 3¹² .

2565243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2565203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47478 + ... + 47531.

It is an arithmetic number, because the mean of its divisors is an integer number (475050).

2^2565243 is an apocalyptic number.

2565243 is a deficient number, since it is larger than the sum of its proper divisors (1235157).

2565243 is an equidigital number, since it uses as much as digits as its factorization.

2565243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95018 (or 95012 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 2565243 is about 1601.6375994588. The cubic root of 2565243 is about 136.8914016750.

The spelling of 2565243 in words is "two million, five hundred sixty-five thousand, two hundred forty-three".