25640241 has 8 divisors (see below), whose sum is σ = 37294944. Its totient is φ = 15539520.

The previous prime is 25640227. The next prime is 25640249. The reversal of 25640241 is 14204652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25640241 - 2¹⁵ = 25607473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25640249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388456 + ... + 388521.

It is an arithmetic number, because the mean of its divisors is an integer number (4661868).

Almost surely, 2^25640241 is an apocalyptic number.

It is an amenable number.

25640241 is a deficient number, since it is larger than the sum of its proper divisors (11654703).

25640241 is a wasteful number, since it uses less digits than its factorization.

25640241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776991.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 25640241 is about 5063.6193577322. The cubic root of 25640241 is about 294.8768652048.

Adding to 25640241 its reverse (14204652), we get a palindrome (39844893).

The spelling of 25640241 in words is "twenty-five million, six hundred forty thousand, two hundred forty-one".