12724809 has 4 divisors (see below), whose sum is σ = 16966416. Its totient is φ = 8483204.

The previous prime is 12724807. The next prime is 12724853. The reversal of 12724809 is 90842721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90842721 = 3 ⋅30280907.

It is a cyclic number.

It is not a de Polignac number, because 12724809 - 2¹ = 12724807 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12724809.

It is not an unprimeable number, because it can be changed into a prime (12724807) 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, 2120799 + ... + 2120804.

It is an arithmetic number, because the mean of its divisors is an integer number (4241604).

Almost surely, 2^12724809 is an apocalyptic number.

It is an amenable number.

12724809 is a deficient number, since it is larger than the sum of its proper divisors (4241607).

12724809 is an equidigital number, since it uses as much as digits as its factorization.

12724809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241606.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 12724809 is about 3567.1850246378. The cubic root of 12724809 is about 233.4624779414.

The spelling of 12724809 in words is "twelve million, seven hundred twenty-four thousand, eight hundred nine".