25840540 has 48 divisors (see below), whose sum is σ = 60046560. Its totient is φ = 9262080.

The previous prime is 25840531. The next prime is 25840543. The reversal of 25840540 is 4504852.

It is a junction number, because it is equal to n+sod(n) for n = 25840499 and 25840508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25840543) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15256 + ... + 16864.

It is an arithmetic number, because the mean of its divisors is an integer number (1250970).

Almost surely, 2^25840540 is an apocalyptic number.

25840540 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 25840540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30023280).

25840540 is an abundant number, since it is smaller than the sum of its proper divisors (34206020).

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

25840540 is a wasteful number, since it uses less digits than its factorization.

25840540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 25840540 is about 5083.3591256176. The cubic root of 25840540 is about 295.6427239156.

The spelling of 25840540 in words is "twenty-five million, eight hundred forty thousand, five hundred forty".