12724291 has 4 divisors (see below), whose sum is σ = 13134784. Its totient is φ = 12313800.

The previous prime is 12724277. The next prime is 12724331. The reversal of 12724291 is 19242721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19242721 = 131 ⋅146891.

It is a cyclic number.

It is not a de Polignac number, because 12724291 - 2⁷ = 12724163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12722291) 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, 205200 + ... + 205261.

It is an arithmetic number, because the mean of its divisors is an integer number (3283696).

Almost surely, 2^12724291 is an apocalyptic number.

12724291 is a deficient number, since it is larger than the sum of its proper divisors (410493).

12724291 is an equidigital number, since it uses as much as digits as its factorization.

12724291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410492.

The product of its digits is 2016, while the sum is 28.

The square root of 12724291 is about 3567.1124176286. The cubic root of 12724291 is about 233.4593099775.

The spelling of 12724291 in words is "twelve million, seven hundred twenty-four thousand, two hundred ninety-one".