25541440 has 28 divisors (see below), whose sum is σ = 60821316. Its totient is φ = 10216448.

The previous prime is 25541437. The next prime is 25541447. The reversal of 25541440 is 4414552.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4528384 + 21013056 = 2128^2 + 4584^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25541447) 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 3 ways as a sum of consecutive naturals, for example, 39589 + ... + 40228.

Almost surely, 2^25541440 is an apocalyptic number.

25541440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25541440 is an abundant number, since it is smaller than the sum of its proper divisors (35279876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25541440 is an equidigital number, since it uses as much as digits as its factorization.

25541440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79834 (or 79824 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 25541440 is about 5053.8539749383. The cubic root of 25541440 is about 294.4976223982.

Adding to 25541440 its reverse (4414552), we get a palindrome (29955992).

The spelling of 25541440 in words is "twenty-five million, five hundred forty-one thousand, four hundred forty".