25145440 has 48 divisors (see below), whose sum is σ = 61998048. Its totient is φ = 9619456.

The previous prime is 25145401. The next prime is 25145443. The reversal of 25145440 is 4454152.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25145443) 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, 264 + ... + 7096.

It is an arithmetic number, because the mean of its divisors is an integer number (1291626).

Almost surely, 2^25145440 is an apocalyptic number.

25145440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25145440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30999024).

25145440 is an abundant number, since it is smaller than the sum of its proper divisors (36852608).

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

25145440 is a wasteful number, since it uses less digits than its factorization.

25145440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871 (or 6863 counting only the distinct ones).

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

The square root of 25145440 is about 5014.5229085128. The cubic root of 25145440 is about 292.9677033053.

Adding to 25145440 its reverse (4454152), we get a palindrome (29599592).

The spelling of 25145440 in words is "twenty-five million, one hundred forty-five thousand, four hundred forty".