12721443 has 16 divisors (see below), whose sum is σ = 19799040. Its totient is φ = 7114176.

The previous prime is 12721441. The next prime is 12721447. The reversal of 12721443 is 34412721.

It is a happy number.

It is not a de Polignac number, because 12721443 - 2¹ = 12721441 is a prime.

It is a super-2 number, since 2×12721443² = 323670224004498, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12721441) 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, 5458 + ... + 7431.

It is an arithmetic number, because the mean of its divisors is an integer number (1237440).

Almost surely, 2^12721443 is an apocalyptic number.

12721443 is a deficient number, since it is larger than the sum of its proper divisors (7077597).

12721443 is a wasteful number, since it uses less digits than its factorization.

12721443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12946.

The product of its digits is 1344, while the sum is 24.

The square root of 12721443 is about 3566.7131928430. The cubic root of 12721443 is about 233.4418907561.

The spelling of 12721443 in words is "twelve million, seven hundred twenty-one thousand, four hundred forty-three".