12643939 has 16 divisors (see below), whose sum is σ = 16275456. Its totient is φ = 9532800.

The previous prime is 12643933. The next prime is 12643999. The reversal of 12643939 is 93934621.

12643939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12643939 - 2⁵ = 12643907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12643898 and 12643907.

It is not an unprimeable number, because it can be changed into a prime (12643933) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262 + ... + 5035.

It is an arithmetic number, because the mean of its divisors is an integer number (1017216).

Almost surely, 2^12643939 is an apocalyptic number.

12643939 is a deficient number, since it is larger than the sum of its proper divisors (3631517).

12643939 is a wasteful number, since it uses less digits than its factorization.

12643939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5346.

The product of its digits is 34992, while the sum is 37.

The square root of 12643939 is about 3555.8316889302. The cubic root of 12643939 is about 232.9668516763.

The spelling of 12643939 in words is "twelve million, six hundred forty-three thousand, nine hundred thirty-nine".