25917840 has 240 divisors, whose sum is σ = 98029440. Its totient is φ = 6289920.

The previous prime is 25917839. The next prime is 25917869. The reversal of 25917840 is 4871952.

It is a tau number, because it is divible by the number of its divisors (240).

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 = 25917795 and 25917804.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 365005 + ... + 365075.

It is an arithmetic number, because the mean of its divisors is an integer number (408456).

Almost surely, 2^25917840 is an apocalyptic number.

25917840 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 25917840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49014720).

25917840 is an abundant number, since it is smaller than the sum of its proper divisors (72111600).

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

25917840 is a wasteful number, since it uses less digits than its factorization.

25917840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 94 counting only the distinct ones).

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

The square root of 25917840 is about 5090.9566880892. The cubic root of 25917840 is about 295.9372279844.

The spelling of 25917840 in words is "twenty-five million, nine hundred seventeen thousand, eight hundred forty".