12643779 has 8 divisors (see below), whose sum is σ = 16879120. Its totient is φ = 8418816.

The previous prime is 12643723. The next prime is 12643781. The reversal of 12643779 is 97734621.

12643779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12643779 - 2¹³ = 12635587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12643879) 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, 939 + ... + 5115.

It is an arithmetic number, because the mean of its divisors is an integer number (2109890).

Almost surely, 2^12643779 is an apocalyptic number.

12643779 is a deficient number, since it is larger than the sum of its proper divisors (4235341).

12643779 is a wasteful number, since it uses less digits than its factorization.

12643779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5189.

The product of its digits is 63504, while the sum is 39.

The square root of 12643779 is about 3555.8091906063. The cubic root of 12643779 is about 232.9658689959.

The spelling of 12643779 in words is "twelve million, six hundred forty-three thousand, seven hundred seventy-nine".