12721696 has 48 divisors (see below), whose sum is σ = 27528984. Its totient is φ = 5750784.

The previous prime is 12721693. The next prime is 12721703. The reversal of 12721696 is 69612721.

It can be written as a sum of positive squares in 4 ways, for example, as 12531600 + 190096 = 3540^2 + 436^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12721693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21760 + ... + 22336.

Almost surely, 2^12721696 is an apocalyptic number.

12721696 is a gapful number since it is divisible by the number (16) 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 12721696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13764492).

12721696 is an abundant number, since it is smaller than the sum of its proper divisors (14807288).

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

12721696 is a wasteful number, since it uses less digits than its factorization.

12721696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653 (or 645 counting only the distinct ones).

The product of its digits is 9072, while the sum is 34.

The square root of 12721696 is about 3566.7486594937. The cubic root of 12721696 is about 233.4434382851.

The spelling of 12721696 in words is "twelve million, seven hundred twenty-one thousand, six hundred ninety-six".