12215808 has 120 divisors (see below), whose sum is σ = 38620296. Its totient is φ = 3686400.

The previous prime is 12215807. The next prime is 12215821. The reversal of 12215808 is 80851221.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50568 + ... + 50808.

Almost surely, 2^12215808 is an apocalyptic number.

12215808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12215808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19310148).

12215808 is an abundant number, since it is smaller than the sum of its proper divisors (26404488).

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

12215808 is a wasteful number, since it uses less digits than its factorization.

12215808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 257 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 12215808 is about 3495.1120153723. The cubic root of 12215808 is about 230.3071385036.

The spelling of 12215808 in words is "twelve million, two hundred fifteen thousand, eight hundred eight".