25197984 has 144 divisors (see below), whose sum is σ = 84913920. Its totient is φ = 6935040.

The previous prime is 25197979. The next prime is 25198021. The reversal of 25197984 is 48979152.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nialpdrome in base 12.

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, 58249 + ... + 58679.

It is an arithmetic number, because the mean of its divisors is an integer number (589680).

Almost surely, 2^25197984 is an apocalyptic number.

25197984 is a gapful number since it is divisible by the number (24) 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 25197984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42456960).

25197984 is an abundant number, since it is smaller than the sum of its proper divisors (59715936).

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

25197984 is a wasteful number, since it uses less digits than its factorization.

25197984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 472 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 25197984 is about 5019.7593567820. The cubic root of 25197984 is about 293.1716234487.

The spelling of 25197984 in words is "twenty-five million, one hundred ninety-seven thousand, nine hundred eighty-four".