25859440 has 20 divisors (see below), whose sum is σ = 60123384. Its totient is φ = 10343744.

The previous prime is 25859417. The next prime is 25859441. The reversal of 25859440 is 4495852.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×25859440² = 1337421274227200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25859440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25859441) 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 3 ways as a sum of consecutive naturals, for example, 161542 + ... + 161701.

Almost surely, 2^25859440 is an apocalyptic number.

25859440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25859440 is an abundant number, since it is smaller than the sum of its proper divisors (34263944).

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

25859440 is a wasteful number, since it uses less digits than its factorization.

25859440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323256 (or 323250 counting only the distinct ones).

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

The square root of 25859440 is about 5085.2177927794. The cubic root of 25859440 is about 295.7147849194.

The spelling of 25859440 in words is "twenty-five million, eight hundred fifty-nine thousand, four hundred forty".