12830721 has 12 divisors (see below), whose sum is σ = 17390352. Its totient is φ = 8413528.

The previous prime is 12830707. The next prime is 12830729. The reversal of 12830721 is 12703821.

It is not a de Polignac number, because 12830721 - 2⁵ = 12830689 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12830691 and 12830700.

It is not an unprimeable number, because it can be changed into a prime (12830729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56410 + ... + 56636.

It is an arithmetic number, because the mean of its divisors is an integer number (1449196).

Almost surely, 2^12830721 is an apocalyptic number.

It is an amenable number.

12830721 is a deficient number, since it is larger than the sum of its proper divisors (4559631).

12830721 is an frugal number, since it uses more digits than its factorization.

12830721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 313 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12830721 is about 3581.9995812395. Note that the first 3 decimals coincide. The cubic root of 12830721 is about 234.1084127638.

The spelling of 12830721 in words is "twelve million, eight hundred thirty thousand, seven hundred twenty-one".