25459840 has 64 divisors (see below), whose sum is σ = 69572160. Its totient is φ = 8727552.

The previous prime is 25459831. The next prime is 25459843. The reversal of 25459840 is 4895452.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 25459840.

It is not an unprimeable number, because it can be changed into a prime (25459843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1639 + ... + 7321.

It is an arithmetic number, because the mean of its divisors is an integer number (1087065).

Almost surely, 2^25459840 is an apocalyptic number.

25459840 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 25459840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34786080).

25459840 is an abundant number, since it is smaller than the sum of its proper divisors (44112320).

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

25459840 is an equidigital number, since it uses as much as digits as its factorization.

25459840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5709 (or 5697 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 25459840 is about 5045.7744697915. The cubic root of 25459840 is about 294.1836666856.

The spelling of 25459840 in words is "twenty-five million, four hundred fifty-nine thousand, eight hundred forty".