25806493 has 12 divisors (see below), whose sum is σ = 28008828. Its totient is φ = 23694720.

The previous prime is 25806479. The next prime is 25806497. The reversal of 25806493 is 39460852.

It can be written as a sum of positive squares in 2 ways, for example, as 13675204 + 12131289 = 3698^2 + 3483^2 .

It is not a de Polignac number, because 25806493 - 2⁵ = 25806461 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 (25806497) 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 11 ways as a sum of consecutive naturals, for example, 31023 + ... + 31843.

It is an arithmetic number, because the mean of its divisors is an integer number (2334069).

Almost surely, 2^25806493 is an apocalyptic number.

It is an amenable number.

25806493 is a deficient number, since it is larger than the sum of its proper divisors (2202335).

25806493 is an equidigital number, since it uses as much as digits as its factorization.

25806493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924 (or 881 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 25806493 is about 5080.0091535351. The cubic root of 25806493 is about 295.5128224524.

The spelling of 25806493 in words is "twenty-five million, eight hundred six thousand, four hundred ninety-three".