12809858 has 4 divisors (see below), whose sum is σ = 19214790. Its totient is φ = 6404928.

The previous prime is 12809843. The next prime is 12809869. The reversal of 12809858 is 85890821.

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

It can be written as a sum of positive squares in only one way, i.e., 12652249 + 157609 = 3557^2 + 397^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3202463 + ... + 3202466.

Almost surely, 2^12809858 is an apocalyptic number.

12809858 is a deficient number, since it is larger than the sum of its proper divisors (6404932).

12809858 is an equidigital number, since it uses as much as digits as its factorization.

12809858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6404931.

The product of its (nonzero) digits is 46080, while the sum is 41.

The square root of 12809858 is about 3579.0861962238. The cubic root of 12809858 is about 233.9814556614.

The spelling of 12809858 in words is "twelve million, eight hundred nine thousand, eight hundred fifty-eight".