25440401 has 4 divisors (see below), whose sum is σ = 29074752. Its totient is φ = 21806052.

The previous prime is 25440397. The next prime is 25440403. The reversal of 25440401 is 10404452.

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 25440401 - 2² = 25440397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25440403) 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, 1817165 + ... + 1817178.

It is an arithmetic number, because the mean of its divisors is an integer number (7268688).

Almost surely, 2^25440401 is an apocalyptic number.

It is an amenable number.

25440401 is a deficient number, since it is larger than the sum of its proper divisors (3634351).

25440401 is an equidigital number, since it uses as much as digits as its factorization.

25440401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3634350.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 25440401 is about 5043.8478367215. The cubic root of 25440401 is about 294.1087762917.

Adding to 25440401 its reverse (10404452), we get a palindrome (35844853).

The spelling of 25440401 in words is "twenty-five million, four hundred forty thousand, four hundred one".