6666939 has 12 divisors (see below), whose sum is σ = 9652656. Its totient is φ = 4434192.

The previous prime is 6666937. The next prime is 6666943. The reversal of 6666939 is 9396666.

6666939 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6666939 - 2¹ = 6666937 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 6666894 and 6666903.

It is not an unprimeable number, because it can be changed into a prime (6666931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6189 + ... + 7185.

It is an arithmetic number, because the mean of its divisors is an integer number (804388).

Almost surely, 2^6666939 is an apocalyptic number.

6666939 is a deficient number, since it is larger than the sum of its proper divisors (2985717).

6666939 is a wasteful number, since it uses less digits than its factorization.

6666939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746 (or 1743 counting only the distinct ones).

The product of its digits is 314928, while the sum is 45.

The square root of 6666939 is about 2582.0416340563. The cubic root of 6666939 is about 188.2097684961.

The spelling of 6666939 in words is "six million, six hundred sixty-six thousand, nine hundred thirty-nine".