25745821 has 8 divisors (see below), whose sum is σ = 26654720. Its totient is φ = 24848208.

The previous prime is 25745791. The next prime is 25745833. The reversal of 25745821 is 12854752.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 25745821 - 2¹⁷ = 25614749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25745851) 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 7 ways as a sum of consecutive naturals, for example, 1960 + ... + 7438.

It is an arithmetic number, because the mean of its divisors is an integer number (3331840).

Almost surely, 2^25745821 is an apocalyptic number.

It is an amenable number.

25745821 is a deficient number, since it is larger than the sum of its proper divisors (908899).

25745821 is a wasteful number, since it uses less digits than its factorization.

25745821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5643.

The product of its digits is 22400, while the sum is 34.

The square root of 25745821 is about 5074.0339967328. The cubic root of 25745821 is about 295.2810536078.

The spelling of 25745821 in words is "twenty-five million, seven hundred forty-five thousand, eight hundred twenty-one".