12866667 has 16 divisors (see below), whose sum is σ = 19701120. Its totient is φ = 7387200.

The previous prime is 12866647. The next prime is 12866681. The reversal of 12866667 is 76666821.

It is a happy number.

It is not a de Polignac number, because 12866667 - 2¹⁸ = 12604523 is a prime.

It is a super-2 number, since 2×12866667² = 331102239377778, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12866617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9634 + ... + 10887.

It is an arithmetic number, because the mean of its divisors is an integer number (1231320).

Almost surely, 2^12866667 is an apocalyptic number.

12866667 is a deficient number, since it is larger than the sum of its proper divisors (6834453).

12866667 is a wasteful number, since it uses less digits than its factorization.

12866667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20554.

The product of its digits is 145152, while the sum is 42.

The square root of 12866667 is about 3587.0136604145. The cubic root of 12866667 is about 234.3268316301.

It can be divided in two parts, 128 and 66667, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 12866667 in words is "twelve million, eight hundred sixty-six thousand, six hundred sixty-seven".