12667891 has 8 divisors (see below), whose sum is σ = 13042944. Its totient is φ = 12298440.

The previous prime is 12667883. The next prime is 12667937. The reversal of 12667891 is 19876621.

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

It is a cyclic number.

It is not a de Polignac number, because 12667891 - 2³ = 12667883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12667841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3426 + ... + 6088.

It is an arithmetic number, because the mean of its divisors is an integer number (1630368).

Almost surely, 2^12667891 is an apocalyptic number.

12667891 is a deficient number, since it is larger than the sum of its proper divisors (375053).

12667891 is an equidigital number, since it uses as much as digits as its factorization.

12667891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801.

The product of its digits is 36288, while the sum is 40.

The square root of 12667891 is about 3559.1980838385. The cubic root of 12667891 is about 233.1138655206.

The spelling of 12667891 in words is "twelve million, six hundred sixty-seven thousand, eight hundred ninety-one".