25209243 has 12 divisors (see below), whose sum is σ = 36491520. Its totient is φ = 16770096.

The previous prime is 25209241. The next prime is 25209251. The reversal of 25209243 is 34290252.

It is not a de Polignac number, because 25209243 - 2¹ = 25209241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25209241) 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 11 ways as a sum of consecutive naturals, for example, 1830 + ... + 7332.

It is an arithmetic number, because the mean of its divisors is an integer number (3040960).

Almost surely, 2^25209243 is an apocalyptic number.

25209243 is a deficient number, since it is larger than the sum of its proper divisors (11282277).

25209243 is a wasteful number, since it uses less digits than its factorization.

25209243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6018 (or 6015 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 25209243 is about 5020.8806996383. The cubic root of 25209243 is about 293.2152820711.

Adding to 25209243 its reverse (34290252), we get a palindrome (59499495).

It can be divided in two parts, 25209 and 243, that added together give a palindrome (25452).

The spelling of 25209243 in words is "twenty-five million, two hundred nine thousand, two hundred forty-three".