12721894 has 16 divisors (see below), whose sum is σ = 20203920. Its totient is φ = 5997600.

The previous prime is 12721847. The next prime is 12721903. The reversal of 12721894 is 49812721.

12721894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57 + ... + 5044.

It is an arithmetic number, because the mean of its divisors is an integer number (1262745).

Almost surely, 2^12721894 is an apocalyptic number.

12721894 is a deficient number, since it is larger than the sum of its proper divisors (7482026).

12721894 is a wasteful number, since it uses less digits than its factorization.

12721894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5175.

The product of its digits is 8064, while the sum is 34.

The square root of 12721894 is about 3566.7764157570. The cubic root of 12721894 is about 233.4446493805. Note that the first 3 decimals are identical.

The spelling of 12721894 in words is "twelve million, seven hundred twenty-one thousand, eight hundred ninety-four".