25816393 has 4 divisors (see below), whose sum is σ = 25863300. Its totient is φ = 25769488.

The previous prime is 25816391. The next prime is 25816423. The reversal of 25816393 is 39361852.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3415104 + 22401289 = 1848^2 + 4733^2 .

It is a cyclic number.

It is not a de Polignac number, because 25816393 - 2¹ = 25816391 is a prime.

It is a super-2 number, since 2×25816393² = 1332972295060898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25816391) 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, 22618 + ... + 23731.

It is an arithmetic number, because the mean of its divisors is an integer number (6465825).

Almost surely, 2^25816393 is an apocalyptic number.

It is an amenable number.

25816393 is a deficient number, since it is larger than the sum of its proper divisors (46907).

25816393 is an equidigital number, since it uses as much as digits as its factorization.

25816393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46906.

The product of its digits is 38880, while the sum is 37.

The square root of 25816393 is about 5080.9834677944. The cubic root of 25816393 is about 295.5506062628.

The spelling of 25816393 in words is "twenty-five million, eight hundred sixteen thousand, three hundred ninety-three".