25117440 has 144 divisors (see below), whose sum is σ = 83198976. Its totient is φ = 6451200.

The previous prime is 25117423. The next prime is 25117441. The reversal of 25117440 is 4471152.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 25117440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25117441) 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 15 ways as a sum of consecutive naturals, for example, 118935 + ... + 119145.

Almost surely, 2^25117440 is an apocalyptic number.

25117440 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 25117440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41599488).

25117440 is an abundant number, since it is smaller than the sum of its proper divisors (58081536).

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

25117440 is a wasteful number, since it uses less digits than its factorization.

25117440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266 (or 252 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 25117440 is about 5011.7302401466. The cubic root of 25117440 is about 292.8589209263.

Adding to 25117440 its reverse (4471152), we get a palindrome (29588592).

The spelling of 25117440 in words is "twenty-five million, one hundred seventeen thousand, four hundred forty".