12721086 has 36 divisors (see below), whose sum is σ = 32064552. Its totient is φ = 3634344.

The previous prime is 12721043. The next prime is 12721087. The reversal of 12721086 is 68012721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721087) 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 17 ways as a sum of consecutive naturals, for example, 6330 + ... + 8093.

It is an arithmetic number, because the mean of its divisors is an integer number (890682).

Almost surely, 2^12721086 is an apocalyptic number.

12721086 is an abundant number, since it is smaller than the sum of its proper divisors (19343466).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12721086 is a wasteful number, since it uses less digits than its factorization.

12721086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14445 (or 14435 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 12721086 is about 3566.6631464157. The cubic root of 12721086 is about 233.4397070538.

The spelling of 12721086 in words is "twelve million, seven hundred twenty-one thousand, eighty-six".