12720366 has 24 divisors (see below), whose sum is σ = 27693120. Its totient is φ = 4219776.

The previous prime is 12720361. The next prime is 12720427. The reversal of 12720366 is 66302721.

It is a happy number.

It is a super-2 number, since 2×12720366² = 323615422347912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720361) 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 in 11 ways as a sum of consecutive naturals, for example, 2430 + ... + 5598.

It is an arithmetic number, because the mean of its divisors is an integer number (1153880).

Almost surely, 2^12720366 is an apocalyptic number.

12720366 is an abundant number, since it is smaller than the sum of its proper divisors (14972754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12720366 is a wasteful number, since it uses less digits than its factorization.

12720366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3400 (or 3397 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 12720366 is about 3566.5622103084. The cubic root of 12720366 is about 233.4353028239.

The spelling of 12720366 in words is "twelve million, seven hundred twenty thousand, three hundred sixty-six".