12215945 has 32 divisors (see below), whose sum is σ = 18144000. Its totient is φ = 7865088.

The previous prime is 12215939. The next prime is 12215947. The reversal of 12215945 is 54951221.

12215945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12215945 - 2¹⁸ = 11953801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12215947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28946 + ... + 29364.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^12215945 is an apocalyptic number.

It is an amenable number.

12215945 is a deficient number, since it is larger than the sum of its proper divisors (5928055).

12215945 is an equidigital number, since it uses as much as digits as its factorization.

12215945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 448 counting only the distinct ones).

The product of its digits is 3600, while the sum is 29.

The square root of 12215945 is about 3495.1316141170. The cubic root of 12215945 is about 230.3079994635.

The spelling of 12215945 in words is "twelve million, two hundred fifteen thousand, nine hundred forty-five".