12320866 has 4 divisors (see below), whose sum is σ = 18481302. Its totient is φ = 6160432.

The previous prime is 12320863. The next prime is 12320881. The reversal of 12320866 is 66802321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66802321 = 79 ⋅845599.

It can be written as a sum of positive squares in only one way, i.e., 10374841 + 1946025 = 3221^2 + 1395^2 .

It is not an unprimeable number, because it can be changed into a prime (12320863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3080215 + ... + 3080218.

Almost surely, 2^12320866 is an apocalyptic number.

12320866 is a deficient number, since it is larger than the sum of its proper divisors (6160436).

12320866 is an equidigital number, since it uses as much as digits as its factorization.

12320866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6160435.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 12320866 is about 3510.1091151131. The cubic root of 12320866 is about 230.9654814959.

The spelling of 12320866 in words is "twelve million, three hundred twenty thousand, eight hundred sixty-six".