12705667 has 4 divisors (see below), whose sum is σ = 13683040. Its totient is φ = 11728296.

The previous prime is 12705659. The next prime is 12705697. The reversal of 12705667 is 76650721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76650721 = 7 ⋅10950103.

It is a cyclic number.

It is not a de Polignac number, because 12705667 - 2³ = 12705659 is a prime.

It is a super-2 number, since 2×12705667² = 322867947829778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12705617) 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 3 ways as a sum of consecutive naturals, for example, 488667 + ... + 488692.

It is an arithmetic number, because the mean of its divisors is an integer number (3420760).

Almost surely, 2^12705667 is an apocalyptic number.

12705667 is a deficient number, since it is larger than the sum of its proper divisors (977373).

12705667 is an equidigital number, since it uses as much as digits as its factorization.

12705667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977372.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 12705667 is about 3564.5009468367. The cubic root of 12705667 is about 233.3453528956.

The spelling of 12705667 in words is "twelve million, seven hundred five thousand, six hundred sixty-seven".