25408040 has 64 divisors (see below), whose sum is σ = 66044160. Its totient is φ = 8616960.

The previous prime is 25408037. The next prime is 25408049. The reversal of 25408040 is 4080452.

It is a junction number, because it is equal to n+sod(n) for n = 25407997 and 25408015.

It is not an unprimeable number, because it can be changed into a prime (25408049) 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, 28400 + ... + 29280.

It is an arithmetic number, because the mean of its divisors is an integer number (1031940).

Almost surely, 2^25408040 is an apocalyptic number.

25408040 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 25408040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33022080).

25408040 is an abundant number, since it is smaller than the sum of its proper divisors (40636120).

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

25408040 is a wasteful number, since it uses less digits than its factorization.

25408040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 998 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 25408040 is about 5040.6388484001. The cubic root of 25408040 is about 293.9840181357.

Adding to 25408040 its reverse (4080452), we get a palindrome (29488492).

The spelling of 25408040 in words is "twenty-five million, four hundred eight thousand, forty".