25981984 has 48 divisors (see below), whose sum is σ = 61907328. Its totient is φ = 10478592.

The previous prime is 25981981. The next prime is 25982009. The reversal of 25981984 is 48918952.

25981984 = 407² + 408² + ... + 525².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25981981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 397 + ... + 7219.

It is an arithmetic number, because the mean of its divisors is an integer number (1289736).

Almost surely, 2^25981984 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 25981984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30953664).

25981984 is an abundant number, since it is smaller than the sum of its proper divisors (35925344).

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

25981984 is a wasteful number, since it uses less digits than its factorization.

25981984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6857 (or 6849 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 25981984 is about 5097.2525933095. The cubic root of 25981984 is about 296.1811649669.

The spelling of 25981984 in words is "twenty-five million, nine hundred eighty-one thousand, nine hundred eighty-four".