12675721 has 4 divisors (see below), whose sum is σ = 12683412. Its totient is φ = 12668032.

The previous prime is 12675713. The next prime is 12675749. The reversal of 12675721 is 12757621.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4473225 + 8202496 = 2115^2 + 2864^2 .

It is a cyclic number.

It is not a de Polignac number, because 12675721 - 2³ = 12675713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12675791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256 + ... + 5041.

It is an arithmetic number, because the mean of its divisors is an integer number (3170853).

Almost surely, 2^12675721 is an apocalyptic number.

It is an amenable number.

12675721 is a deficient number, since it is larger than the sum of its proper divisors (7691).

12675721 is an equidigital number, since it uses as much as digits as its factorization.

12675721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7690.

The product of its digits is 5880, while the sum is 31.

The square root of 12675721 is about 3560.2978807959. The cubic root of 12675721 is about 233.1618847115.

The spelling of 12675721 in words is "twelve million, six hundred seventy-five thousand, seven hundred twenty-one".