25493840 has 40 divisors (see below), whose sum is σ = 60659808. Its totient is φ = 9959040.

The previous prime is 25493833. The next prime is 25493843. The reversal of 25493840 is 4839452.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 25493840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25493843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 7145.

Almost surely, 2^25493840 is an apocalyptic number.

25493840 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 25493840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30329904).

25493840 is an abundant number, since it is smaller than the sum of its proper divisors (35165968).

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

25493840 is a wasteful number, since it uses less digits than its factorization.

25493840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7467 (or 7461 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 25493840 is about 5049.1425014551. The cubic root of 25493840 is about 294.3145629718.

The spelling of 25493840 in words is "twenty-five million, four hundred ninety-three thousand, eight hundred forty".