12859981 has 4 divisors (see below), whose sum is σ = 12867264. Its totient is φ = 12852700.

The previous prime is 12859961. The next prime is 12859997. The reversal of 12859981 is 18995821.

12859981 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, 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 12859981 - 2⁵ = 12859949 is a prime.

It is a super-4 number, since 4×12859981⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12859901) 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, 876 + ... + 5146.

It is an arithmetic number, because the mean of its divisors is an integer number (3216816).

Almost surely, 2^12859981 is an apocalyptic number.

It is an amenable number.

12859981 is a deficient number, since it is larger than the sum of its proper divisors (7283).

12859981 is an equidigital number, since it uses as much as digits as its factorization.

12859981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7282.

The product of its digits is 51840, while the sum is 43.

The square root of 12859981 is about 3586.0815662782. The cubic root of 12859981 is about 234.2862362776.

The spelling of 12859981 in words is "twelve million, eight hundred fifty-nine thousand, nine hundred eighty-one".