12731289 has 8 divisors (see below), whose sum is σ = 17295552. Its totient is φ = 8327280.

The previous prime is 12731281. The next prime is 12731339. The reversal of 12731289 is 98213721.

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

It is not a de Polignac number, because 12731289 - 2³ = 12731281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12731281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39877 + ... + 40194.

It is an arithmetic number, because the mean of its divisors is an integer number (2161944).

Almost surely, 2^12731289 is an apocalyptic number.

It is an amenable number.

12731289 is a deficient number, since it is larger than the sum of its proper divisors (4564263).

12731289 is an equidigital number, since it uses as much as digits as its factorization.

12731289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80127.

The product of its digits is 6048, while the sum is 33.

The square root of 12731289 is about 3568.0931882449. The cubic root of 12731289 is about 233.5021008054.

The spelling of 12731289 in words is "twelve million, seven hundred thirty-one thousand, two hundred eighty-nine".