25257243 has 32 divisors (see below), whose sum is σ = 38817792. Its totient is φ = 14458400.

The previous prime is 25257241. The next prime is 25257259. The reversal of 25257243 is 34275252.

It is not a de Polignac number, because 25257243 - 2¹ = 25257241 is a prime.

It is a super-2 number, since 2×25257243² = 1275856647922098, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25257243.

It is not an unprimeable number, because it can be changed into a prime (25257241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 81058 + ... + 81368.

It is an arithmetic number, because the mean of its divisors is an integer number (1213056).

Almost surely, 2^25257243 is an apocalyptic number.

25257243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

25257243 is a deficient number, since it is larger than the sum of its proper divisors (13560549).

25257243 is a wasteful number, since it uses less digits than its factorization.

25257243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455.

The product of its digits is 16800, while the sum is 30.

The square root of 25257243 is about 5025.6584643209. The cubic root of 25257243 is about 293.4012642545.

Subtracting 25257243 from its reverse (34275252), we obtain a square (9018009 = 3003²).

The spelling of 25257243 in words is "twenty-five million, two hundred fifty-seven thousand, two hundred forty-three".