12921859 has 4 divisors (see below), whose sum is σ = 12929616. Its totient is φ = 12914104.

The previous prime is 12921833. The next prime is 12921863. The reversal of 12921859 is 95812921.

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 is a cyclic number.

It is not a de Polignac number, because 12921859 - 2¹⁵ = 12889091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12921809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244 + ... + 5089.

It is an arithmetic number, because the mean of its divisors is an integer number (3232404).

Almost surely, 2^12921859 is an apocalyptic number.

12921859 is a deficient number, since it is larger than the sum of its proper divisors (7757).

12921859 is an equidigital number, since it uses as much as digits as its factorization.

12921859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756.

The product of its digits is 12960, while the sum is 37.

The square root of 12921859 is about 3594.6987356384. The cubic root of 12921859 is about 234.6614046344.

The spelling of 12921859 in words is "twelve million, nine hundred twenty-one thousand, eight hundred fifty-nine".