12861139 has 8 divisors (see below), whose sum is σ = 13173840. Its totient is φ = 12551136.

The previous prime is 12861137. The next prime is 12861143. The reversal of 12861139 is 93116821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12861139 - 2¹ = 12861137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12861139.

It is not an unprimeable number, because it can be changed into a prime (12861131) 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 7 ways as a sum of consecutive naturals, for example, 11497 + ... + 12565.

It is an arithmetic number, because the mean of its divisors is an integer number (1646730).

Almost surely, 2^12861139 is an apocalyptic number.

12861139 is a deficient number, since it is larger than the sum of its proper divisors (312701).

12861139 is a wasteful number, since it uses less digits than its factorization.

12861139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349.

The product of its digits is 2592, while the sum is 31.

The square root of 12861139 is about 3586.2430202093. The cubic root of 12861139 is about 234.2932683076.

The spelling of 12861139 in words is "twelve million, eight hundred sixty-one thousand, one hundred thirty-nine".