25421982 has 8 divisors (see below), whose sum is σ = 50843976. Its totient is φ = 8473992.

The previous prime is 25421947. The next prime is 25421983. The reversal of 25421982 is 28912452.

It is a sphenic number, since it is the product of 3 distinct primes.

25421982 is an admirable number.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2118493 + ... + 2118504.

It is an arithmetic number, because the mean of its divisors is an integer number (6355497).

Almost surely, 2^25421982 is an apocalyptic number.

25421982 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25421982 is a wasteful number, since it uses less digits than its factorization.

25421982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4237002.

The product of its digits is 11520, while the sum is 33.

The square root of 25421982 is about 5042.0216183590. The cubic root of 25421982 is about 294.0377803269.

Adding to 25421982 its sum of digits (33), we get a triangular number (25422015 = T₇₁₃₀).

The spelling of 25421982 in words is "twenty-five million, four hundred twenty-one thousand, nine hundred eighty-two".