12665867 has 4 divisors (see below), whose sum is σ = 13410936. Its totient is φ = 11920800.

The previous prime is 12665839. The next prime is 12665869. The reversal of 12665867 is 76856621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76856621 = 257 ⋅299053.

It is a cyclic number.

It is not a de Polignac number, because 12665867 - 2¹⁶ = 12600331 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12665869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 372509 + ... + 372542.

It is an arithmetic number, because the mean of its divisors is an integer number (3352734).

Almost surely, 2^12665867 is an apocalyptic number.

12665867 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

12665867 is a deficient number, since it is larger than the sum of its proper divisors (745069).

12665867 is an equidigital number, since it uses as much as digits as its factorization.

12665867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745068.

The product of its digits is 120960, while the sum is 41.

The square root of 12665867 is about 3558.9137387692. The cubic root of 12665867 is about 233.1014496787.

The spelling of 12665867 in words is "twelve million, six hundred sixty-five thousand, eight hundred sixty-seven".