12863721 has 16 divisors (see below), whose sum is σ = 18536000. Its totient is φ = 7888320.

The previous prime is 12863699. The next prime is 12863723. The reversal of 12863721 is 12736821.

12863721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12863721 - 2⁵ = 12863689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12863723) 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, 19131 + ... + 19791.

It is an arithmetic number, because the mean of its divisors is an integer number (1158500).

Almost surely, 2^12863721 is an apocalyptic number.

It is an amenable number.

12863721 is a deficient number, since it is larger than the sum of its proper divisors (5672279).

12863721 is a wasteful number, since it uses less digits than its factorization.

12863721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176.

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

The square root of 12863721 is about 3586.6029889019. The cubic root of 12863721 is about 234.3089461503.

The spelling of 12863721 in words is "twelve million, eight hundred sixty-three thousand, seven hundred twenty-one".