25826921 has 4 divisors (see below), whose sum is σ = 25838292. Its totient is φ = 25815552.

The previous prime is 25826887. The next prime is 25826951. The reversal of 25826921 is 12962852.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 18181696 + 7645225 = 4264^2 + 2765^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25826921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25826951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980 + ... + 7253.

It is an arithmetic number, because the mean of its divisors is an integer number (6459573).

Almost surely, 2^25826921 is an apocalyptic number.

It is an amenable number.

25826921 is a deficient number, since it is larger than the sum of its proper divisors (11371).

25826921 is an equidigital number, since it uses as much as digits as its factorization.

25826921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11370.

The product of its digits is 17280, while the sum is 35.

The square root of 25826921 is about 5082.0193820961. The cubic root of 25826921 is about 295.5907762678.

The spelling of 25826921 in words is "twenty-five million, eight hundred twenty-six thousand, nine hundred twenty-one".