25195440 has 80 divisors (see below), whose sum is σ = 79432416. Its totient is φ = 6604800.

The previous prime is 25195427. The next prime is 25195441. The reversal of 25195440 is 4459152.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25195398 and 25195407.

It is not an unprimeable number, because it can be changed into a prime (25195441) 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, 13780 + ... + 15500.

Almost surely, 2^25195440 is an apocalyptic number.

25195440 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 25195440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39716208).

25195440 is an abundant number, since it is smaller than the sum of its proper divisors (54236976).

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

25195440 is a wasteful number, since it uses less digits than its factorization.

25195440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798 (or 1792 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 25195440 is about 5019.5059517845. The cubic root of 25195440 is about 293.1617568696.

The spelling of 25195440 in words is "twenty-five million, one hundred ninety-five thousand, four hundred forty".