12742809 has 8 divisors (see below), whose sum is σ = 17989920. Its totient is φ = 7995456.

The previous prime is 12742801. The next prime is 12742811. The reversal of 12742809 is 90824721.

It is a happy number.

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

It is not a de Polignac number, because 12742809 - 2³ = 12742801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12742809.

It is not an unprimeable number, because it can be changed into a prime (12742801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124879 + ... + 124980.

It is an arithmetic number, because the mean of its divisors is an integer number (2248740).

Almost surely, 2^12742809 is an apocalyptic number.

It is an amenable number.

12742809 is a deficient number, since it is larger than the sum of its proper divisors (5247111).

12742809 is a wasteful number, since it uses less digits than its factorization.

12742809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249879.

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

The square root of 12742809 is about 3569.7071308442. The cubic root of 12742809 is about 233.5725082682.

The spelling of 12742809 in words is "twelve million, seven hundred forty-two thousand, eight hundred nine".