12215788 has 24 divisors (see below), whose sum is σ = 23122512. Its totient is φ = 5613504.

The previous prime is 12215779. The next prime is 12215807. The reversal of 12215788 is 88751221.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17706 + ... + 18382.

It is an arithmetic number, because the mean of its divisors is an integer number (963438).

Almost surely, 2^12215788 is an apocalyptic number.

It is an amenable number.

12215788 is a deficient number, since it is larger than the sum of its proper divisors (10906724).

12215788 is a wasteful number, since it uses less digits than its factorization.

12215788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041 (or 1039 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 12215788 is about 3495.1091542325. The cubic root of 12215788 is about 230.3070128155.

The spelling of 12215788 in words is "twelve million, two hundred fifteen thousand, seven hundred eighty-eight".