12819861 has 12 divisors (see below), whose sum is σ = 18912192. Its totient is φ = 8364456.

The previous prime is 12819857. The next prime is 12819869. The reversal of 12819861 is 16891821.

It is not a de Polignac number, because 12819861 - 2² = 12819857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12819869) 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, 14731 + ... + 15576.

It is an arithmetic number, because the mean of its divisors is an integer number (1576016).

Almost surely, 2^12819861 is an apocalyptic number.

It is an amenable number.

12819861 is a deficient number, since it is larger than the sum of its proper divisors (6092331).

12819861 is a wasteful number, since it uses less digits than its factorization.

12819861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30360 (or 30357 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 12819861 is about 3580.4833472591. The cubic root of 12819861 is about 234.0423438603.

The spelling of 12819861 in words is "twelve million, eight hundred nineteen thousand, eight hundred sixty-one".