12667789 has 2 divisors, whose sum is σ = 12667790. Its totient is φ = 12667788.

The previous prime is 12667783. The next prime is 12667817. The reversal of 12667789 is 98776621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6502500 + 6165289 = 2550^2 + 2483^2 .

It is an emirp because it is prime and its reverse (98776621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12667789 - 2¹³ = 12659597 is a prime.

It is a Chen prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12667783) 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 as a sum of consecutive naturals, namely, 6333894 + 6333895.

It is an arithmetic number, because the mean of its divisors is an integer number (6333895).

Almost surely, 2^12667789 is an apocalyptic number.

It is an amenable number.

12667789 is a deficient number, since it is larger than the sum of its proper divisors (1).

12667789 is an equidigital number, since it uses as much as digits as its factorization.

12667789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 12667789 is about 3559.1837547393. The cubic root of 12667789 is about 233.1132398527.

It can be divided in two parts, 12667 and 789, that added together give a square (13456 = 116²).

The spelling of 12667789 in words is "twelve million, six hundred sixty-seven thousand, seven hundred eighty-nine".