25434240 has 128 divisors (see below), whose sum is σ = 87393600. Its totient is φ = 6254592.

The previous prime is 25434203. The next prime is 25434257. The reversal of 25434240 is 4243452.

It is a tau number, because it is divible by the number of its divisors (128).

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 25434240.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24451 + ... + 25469.

Almost surely, 2^25434240 is an apocalyptic number.

25434240 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 25434240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43696800).

25434240 is an abundant number, since it is smaller than the sum of its proper divisors (61959360).

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

25434240 is a wasteful number, since it uses less digits than its factorization.

25434240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054 (or 1042 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 25434240 is about 5043.2370557014. The cubic root of 25434240 is about 294.0850325561.

Adding to 25434240 its reverse (4243452), we get a palindrome (29677692).

The spelling of 25434240 in words is "twenty-five million, four hundred thirty-four thousand, two hundred forty".