12721642 has 8 divisors (see below), whose sum is σ = 19107396. Its totient is φ = 6352512.

The previous prime is 12721609. The next prime is 12721651. The reversal of 12721642 is 24612721.

12721642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11029041 + 1692601 = 3321^2 + 1301^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2023 + ... + 5434.

Almost surely, 2^12721642 is an apocalyptic number.

12721642 is a deficient number, since it is larger than the sum of its proper divisors (6385754).

12721642 is an equidigital number, since it uses as much as digits as its factorization.

12721642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8312.

The product of its digits is 1344, while the sum is 25.

The square root of 12721642 is about 3566.7410895662. The cubic root of 12721642 is about 233.4431079842.

The spelling of 12721642 in words is "twelve million, seven hundred twenty-one thousand, six hundred forty-two".