25905440 has 96 divisors (see below), whose sum is σ = 68584320. Its totient is φ = 9164800.

The previous prime is 25905431. The next prime is 25905457. The reversal of 25905440 is 4450952.

It is a happy 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, 71981 + ... + 72339.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^25905440 is an apocalyptic number.

25905440 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 25905440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34292160).

25905440 is an abundant number, since it is smaller than the sum of its proper divisors (42678880).

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

25905440 is a wasteful number, since it uses less digits than its factorization.

25905440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 25905440 is about 5089.7386966327. The cubic root of 25905440 is about 295.8900248866.

The spelling of 25905440 in words is "twenty-five million, nine hundred five thousand, four hundred forty".