12721744 has 40 divisors (see below), whose sum is σ = 28484288. Its totient is φ = 5391360.

The previous prime is 12721739. The next prime is 12721771. The reversal of 12721744 is 44712721.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a nude number because it is divisible by every one of its digits.

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, 10279 + ... + 11449.

Almost surely, 2^12721744 is an apocalyptic number.

12721744 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12721744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14242144).

12721744 is an abundant number, since it is smaller than the sum of its proper divisors (15762544).

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

12721744 is a wasteful number, since it uses less digits than its factorization.

12721744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283 (or 1277 counting only the distinct ones).

The product of its digits is 3136, while the sum is 28.

The square root of 12721744 is about 3566.7553883046. The cubic root of 12721744 is about 233.4437318851.

The spelling of 12721744 in words is "twelve million, seven hundred twenty-one thousand, seven hundred forty-four".