12001667 has 2 divisors, whose sum is σ = 12001668. Its totient is φ = 12001666.

The previous prime is 12001571. The next prime is 12001697. The reversal of 12001667 is 76610021.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12001667 - 2⁸ = 12001411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12001697) 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, 6000833 + 6000834.

It is an arithmetic number, because the mean of its divisors is an integer number (6000834).

Almost surely, 2^12001667 is an apocalyptic number.

12001667 is a deficient number, since it is larger than the sum of its proper divisors (1).

12001667 is an equidigital number, since it uses as much as digits as its factorization.

12001667 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 12001667 is about 3464.3422175068. The cubic root of 12001667 is about 228.9534493456.

Adding to 12001667 its reverse (76610021), we get a palindrome (88611688).

The spelling of 12001667 in words is "twelve million, one thousand, six hundred sixty-seven".