12920667 has 4 divisors (see below), whose sum is σ = 17227560. Its totient is φ = 8613776.

The previous prime is 12920657. The next prime is 12920669. The reversal of 12920667 is 76602921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76602921 = 3 ⋅25534307.

It is a cyclic number.

It is not a de Polignac number, because 12920667 - 2¹⁶ = 12855131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12920669) 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, 2153442 + ... + 2153447.

It is an arithmetic number, because the mean of its divisors is an integer number (4306890).

Almost surely, 2^12920667 is an apocalyptic number.

12920667 is a deficient number, since it is larger than the sum of its proper divisors (4306893).

12920667 is an equidigital number, since it uses as much as digits as its factorization.

12920667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4306892.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 12920667 is about 3594.5329321068. The cubic root of 12920667 is about 234.6541888255.

The spelling of 12920667 in words is "twelve million, nine hundred twenty thousand, six hundred sixty-seven".