12721893 has 16 divisors (see below), whose sum is σ = 17364480. Its totient is φ = 8282736.

The previous prime is 12721847. The next prime is 12721903. The reversal of 12721893 is 39812721.

12721893 is digitally balanced in base 2, base 3 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12721893 - 2¹² = 12717797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12721843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33378 + ... + 33756.

It is an arithmetic number, because the mean of its divisors is an integer number (1085280).

Almost surely, 2^12721893 is an apocalyptic number.

It is an amenable number.

12721893 is a deficient number, since it is larger than the sum of its proper divisors (4642587).

12721893 is a wasteful number, since it uses less digits than its factorization.

12721893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 616.

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

The square root of 12721893 is about 3566.7762755743. The cubic root of 12721893 is about 233.4446432639. Note that the first 3 decimals are identical.

The spelling of 12721893 in words is "twelve million, seven hundred twenty-one thousand, eight hundred ninety-three".