12861489 has 8 divisors (see below), whose sum is σ = 17214912. Its totient is φ = 8541200.

The previous prime is 12861481. The next prime is 12861493. The reversal of 12861489 is 98416821.

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 12861489 - 2³ = 12861481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12861481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7362 + ... + 8939.

It is an arithmetic number, because the mean of its divisors is an integer number (2151864).

Almost surely, 2^12861489 is an apocalyptic number.

It is an amenable number.

12861489 is a deficient number, since it is larger than the sum of its proper divisors (4353423).

12861489 is a wasteful number, since it uses less digits than its factorization.

12861489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16567.

The product of its digits is 27648, while the sum is 39.

The square root of 12861489 is about 3586.2918174627. The cubic root of 12861489 is about 234.2953936222.

It can be divided in two parts, 1286 and 1489, that added together give a triangular number (2775 = T₇₄).

The spelling of 12861489 in words is "twelve million, eight hundred sixty-one thousand, four hundred eighty-nine".