25187940 has 72 divisors (see below), whose sum is σ = 78289848. Its totient is φ = 6551040.

The previous prime is 25187881. The next prime is 25187957. The reversal of 25187940 is 4978152.

It can be written as a sum of positive squares in 4 ways, for example, as 2377764 + 22810176 = 1542^2 + 4776^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25187895 and 25187904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5674 + ... + 9086.

It is an arithmetic number, because the mean of its divisors is an integer number (1087359).

Almost surely, 2^25187940 is an apocalyptic number.

25187940 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 25187940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39144924).

25187940 is an abundant number, since it is smaller than the sum of its proper divisors (53101908).

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

25187940 is a wasteful number, since it uses less digits than its factorization.

25187940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3469 (or 3464 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 25187940 is about 5018.7588107021. The cubic root of 25187940 is about 293.1326652115.

The spelling of 25187940 in words is "twenty-five million, one hundred eighty-seven thousand, nine hundred forty".