12721386 has 8 divisors (see below), whose sum is σ = 25442784. Its totient is φ = 4240460.

The previous prime is 12721363. The next prime is 12721391. The reversal of 12721386 is 68312721.

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

12721386 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1060110 + ... + 1060121.

It is an arithmetic number, because the mean of its divisors is an integer number (3180348).

Almost surely, 2^12721386 is an apocalyptic number.

12721386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12721386 is a wasteful number, since it uses less digits than its factorization.

12721386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120236.

The product of its digits is 4032, while the sum is 30.

The square root of 12721386 is about 3566.7052022840. The cubic root of 12721386 is about 233.4415421005.

The spelling of 12721386 in words is "twelve million, seven hundred twenty-one thousand, three hundred eighty-six".