25171040 has 48 divisors (see below), whose sum is σ = 60464880. Its totient is φ = 9899520.

The previous prime is 25171031. The next prime is 25171049. The reversal of 25171040 is 4017152.

It is an interprime number because it is at equal distance from previous prime (25171031) and next prime (25171049).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25171049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8471 + ... + 11049.

It is an arithmetic number, because the mean of its divisors is an integer number (1259685).

Almost surely, 2^25171040 is an apocalyptic number.

25171040 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 25171040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30232440).

25171040 is an abundant number, since it is smaller than the sum of its proper divisors (35293840).

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

25171040 is a wasteful number, since it uses less digits than its factorization.

25171040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655 (or 2647 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 25171040 is about 5017.0748449669. The cubic root of 25171040 is about 293.0670908345.

Adding to 25171040 its reverse (4017152), we get a palindrome (29188192).

The spelling of 25171040 in words is "twenty-five million, one hundred seventy-one thousand, forty".