12680721 has 9 divisors (see below), whose sum is σ = 18332041. Its totient is φ = 8446692.

The previous prime is 12680719. The next prime is 12680737. The reversal of 12680721 is 12708621.

The square root of 12680721 is 3561.

It is a perfect power (a square), and thus also a powerful number.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 12680721 - 2¹ = 12680719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12680711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 10090 + ... + 11276.

Almost surely, 2^12680721 is an apocalyptic number.

12680721 is the 3561-st square number.

12680721 is the 1781-st centered octagonal number.

It is an amenable number.

12680721 is a deficient number, since it is larger than the sum of its proper divisors (5651320).

12680721 is an frugal number, since it uses more digits than its factorization.

12680721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2380 (or 1190 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The cubic root of 12680721 is about 233.1925379624.

The spelling of 12680721 in words is "twelve million, six hundred eighty thousand, seven hundred twenty-one".