12712721 has 12 divisors (see below), whose sum is σ = 15214656. Its totient is φ = 10385760.

The previous prime is 12712703. The next prime is 12712727. The reversal of 12712721 is 12721721.

12712721 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12712721 - 2⁶ = 12712657 is a prime.

It is a super-2 number, since 2×12712721² = 323226550447682, which contains 22 as substring.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

12712721 is strictly pandigital in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12712727) 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, 45101 + ... + 45381.

It is an arithmetic number, because the mean of its divisors is an integer number (1267888).

Almost surely, 2^12712721 is an apocalyptic number.

It is an amenable number.

12712721 is a deficient number, since it is larger than the sum of its proper divisors (2501935).

12712721 is an frugal number, since it uses more digits than its factorization.

12712721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592 (or 311 counting only the distinct ones).

The product of its digits is 392, while the sum is 23.

The square root of 12712721 is about 3565.4902888663. The cubic root of 12712721 is about 233.3885282125.

The spelling of 12712721 in words is "twelve million, seven hundred twelve thousand, seven hundred twenty-one".