25421984 has 72 divisors (see below), whose sum is σ = 60213888. Its totient is φ = 10523520.

The previous prime is 25421983. The next prime is 25421989. The reversal of 25421984 is 48912452.

It is not an unprimeable number, because it can be changed into a prime (25421983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 48347 + ... + 48869.

It is an arithmetic number, because the mean of its divisors is an integer number (836304).

Almost surely, 2^25421984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25421984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30106944).

25421984 is an abundant number, since it is smaller than the sum of its proper divisors (34791904).

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

25421984 is a wasteful number, since it uses less digits than its factorization.

25421984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578 (or 563 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 25421984 is about 5042.0218166922. The cubic root of 25421984 is about 294.0377880378.

The spelling of 25421984 in words is "twenty-five million, four hundred twenty-one thousand, nine hundred eighty-four".