12721985 has 8 divisors (see below), whose sum is σ = 15314496. Its totient is φ = 10145520.

The previous prime is 12721939. The next prime is 12721999. The reversal of 12721985 is 58912721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12721985 - 2¹² = 12717889 is a prime.

It is a Duffinian 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, 2189 + ... + 5498.

It is an arithmetic number, because the mean of its divisors is an integer number (1914312).

Almost surely, 2^12721985 is an apocalyptic number.

It is an amenable number.

12721985 is a deficient number, since it is larger than the sum of its proper divisors (2592511).

12721985 is an equidigital number, since it uses as much as digits as its factorization.

12721985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8023.

The product of its digits is 10080, while the sum is 35.

The square root of 12721985 is about 3566.7891723510. The cubic root of 12721985 is about 233.4452059908.

The spelling of 12721985 in words is "twelve million, seven hundred twenty-one thousand, nine hundred eighty-five".