12721544 has 16 divisors (see below), whose sum is σ = 26021520. Its totient is φ = 5782480.

The previous prime is 12721531. The next prime is 12721549. The reversal of 12721544 is 44512721.

It is not an unprimeable number, because it can be changed into a prime (12721549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72194 + ... + 72369.

It is an arithmetic number, because the mean of its divisors is an integer number (1626345).

Almost surely, 2^12721544 is an apocalyptic number.

It is an amenable number.

12721544 is an abundant number, since it is smaller than the sum of its proper divisors (13299976).

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

12721544 is a wasteful number, since it uses less digits than its factorization.

12721544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144580 (or 144576 counting only the distinct ones).

The product of its digits is 2240, while the sum is 26.

The square root of 12721544 is about 3566.7273515087. The cubic root of 12721544 is about 233.4425085468.

The spelling of 12721544 in words is "twelve million, seven hundred twenty-one thousand, five hundred forty-four".