25866243 has 16 divisors (see below), whose sum is σ = 41268640. Its totient is φ = 15917472.

The previous prime is 25866229. The next prime is 25866271. The reversal of 25866243 is 34266852.

25866243 is a `hidden beast` number, since 25 + 8 + 6 + 624 + 3 = 666.

It is not a de Polignac number, because 25866243 - 2⁴ = 25866227 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25866198 and 25866207.

It is not an unprimeable number, because it can be changed into a prime (25866143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36496 + ... + 37197.

It is an arithmetic number, because the mean of its divisors is an integer number (2579290).

Almost surely, 2^25866243 is an apocalyptic number.

25866243 is a deficient number, since it is larger than the sum of its proper divisors (15402397).

25866243 is a wasteful number, since it uses less digits than its factorization.

25866243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73715 (or 73709 counting only the distinct ones).

The product of its digits is 69120, while the sum is 36.

The square root of 25866243 is about 5085.8866483633. The cubic root of 25866243 is about 295.7407144741.

The spelling of 25866243 in words is "twenty-five million, eight hundred sixty-six thousand, two hundred forty-three".