25640441 has 6 divisors (see below), whose sum is σ = 26495226. Its totient is φ = 24812400.

The previous prime is 25640429. The next prime is 25640453. The reversal of 25640441 is 14404652.

It is an interprime number because it is at equal distance from previous prime (25640429) and next prime (25640453).

It can be written as a sum of positive squares in only one way, i.e., 12931216 + 12709225 = 3596^2 + 3565^2 .

It is a de Polignac number, because none of the positive numbers 2^k-25640441 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 25640441.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12380 + ... + 14301.

It is an arithmetic number, because the mean of its divisors is an integer number (4415871).

Almost surely, 2^25640441 is an apocalyptic number.

It is an amenable number.

25640441 is a deficient number, since it is larger than the sum of its proper divisors (854785).

25640441 is an equidigital number, since it uses as much as digits as its factorization.

25640441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26743 (or 26712 counting only the distinct ones).

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

The square root of 25640441 is about 5063.6391064135. The cubic root of 25640441 is about 294.8776319061.

The spelling of 25640441 in words is "twenty-five million, six hundred forty thousand, four hundred forty-one".