12285721 has 12 divisors (see below), whose sum is σ = 14391588. Its totient is φ = 10456992.

The previous prime is 12285709. The next prime is 12285731. The reversal of 12285721 is 12758221.

It can be written as a sum of positive squares in 2 ways, for example, as 3013696 + 9272025 = 1736^2 + 3045^2 .

It is not a de Polignac number, because 12285721 - 2¹⁵ = 12252953 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12285721.

It is not an unprimeable number, because it can be changed into a prime (12285731) 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, 6895 + ... + 8491.

It is an arithmetic number, because the mean of its divisors is an integer number (1199299).

Almost surely, 2^12285721 is an apocalyptic number.

It is an amenable number.

12285721 is a deficient number, since it is larger than the sum of its proper divisors (2105867).

12285721 is a wasteful number, since it uses less digits than its factorization.

12285721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768 (or 1761 counting only the distinct ones).

The product of its digits is 2240, while the sum is 28.

The square root of 12285721 is about 3505.0992853270. The cubic root of 12285721 is about 230.7456643655.

The spelling of 12285721 in words is "twelve million, two hundred eighty-five thousand, seven hundred twenty-one".