25865406 has 48 divisors (see below), whose sum is σ = 66428544. Its totient is φ = 7389144.

The previous prime is 25865401. The next prime is 25865407. The reversal of 25865406 is 60456852.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25865401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 400 + ... + 7203.

It is an arithmetic number, because the mean of its divisors is an integer number (1383928).

Almost surely, 2^25865406 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25865406, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33214272).

25865406 is an abundant number, since it is smaller than the sum of its proper divisors (40563138).

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

25865406 is an equidigital number, since it uses as much as digits as its factorization.

25865406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7627 (or 7615 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 25865406 is about 5085.8043611606. The cubic root of 25865406 is about 295.7375245037.

The spelling of 25865406 in words is "twenty-five million, eight hundred sixty-five thousand, four hundred six".