25440641 has 4 divisors (see below), whose sum is σ = 25678512. Its totient is φ = 25202772.

The previous prime is 25440581. The next prime is 25440647. The reversal of 25440641 is 14604452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25440641 - 2¹⁸ = 25178497 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25440641.

It is not an unprimeable number, because it can be changed into a prime (25440647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118775 + ... + 118988.

It is an arithmetic number, because the mean of its divisors is an integer number (6419628).

Almost surely, 2^25440641 is an apocalyptic number.

It is an amenable number.

25440641 is a deficient number, since it is larger than the sum of its proper divisors (237871).

25440641 is a wasteful number, since it uses less digits than its factorization.

25440641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237870.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 25440641 is about 5043.8716280254. The cubic root of 25440641 is about 294.1097011445.

The spelling of 25440641 in words is "twenty-five million, four hundred forty thousand, six hundred forty-one".