25431040 has 44 divisors (see below), whose sum is σ = 61016976. Its totient is φ = 10170368.

The previous prime is 25431013. The next prime is 25431053. The reversal of 25431040 is 4013452.

It is a junction number, because it is equal to n+sod(n) for n = 25430999 and 25431017.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2637 + ... + 7603.

Almost surely, 2^25431040 is an apocalyptic number.

25431040 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 25431040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30508488).

25431040 is an abundant number, since it is smaller than the sum of its proper divisors (35585936).

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

25431040 is an equidigital number, since it uses as much as digits as its factorization.

25431040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4992 (or 4974 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25431040 is about 5042.9197891698. The cubic root of 25431040 is about 294.0726986370.

Adding to 25431040 its reverse (4013452), we get a palindrome (29444492).

The spelling of 25431040 in words is "twenty-five million, four hundred thirty-one thousand, forty".