12721873 has 4 divisors (see below), whose sum is σ = 13132288. Its totient is φ = 12311460.

The previous prime is 12721847. The next prime is 12721903. The reversal of 12721873 is 37812721.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12721873 - 2⁹ = 12721361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 410383 = 12721873 / (1 + 2 + 7 + 2 + 1 + 8 + 7 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12721843) 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 3 ways as a sum of consecutive naturals, for example, 205161 + ... + 205222.

It is an arithmetic number, because the mean of its divisors is an integer number (3283072).

Almost surely, 2^12721873 is an apocalyptic number.

It is an amenable number.

12721873 is a deficient number, since it is larger than the sum of its proper divisors (410415).

12721873 is an equidigital number, since it uses as much as digits as its factorization.

12721873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410414.

The product of its digits is 4704, while the sum is 31.

The square root of 12721873 is about 3566.7734719211. The cubic root of 12721873 is about 233.4445209316. Note that the first 3 decimals are identical.

The spelling of 12721873 in words is "twelve million, seven hundred twenty-one thousand, eight hundred seventy-three".