12215898 has 48 divisors (see below), whose sum is σ = 29090880. Its totient is φ = 3687552.

The previous prime is 12215897. The next prime is 12215899. The reversal of 12215898 is 89851221.

It is an interprime number because it is at equal distance from previous prime (12215897) and next prime (12215899).

It is not an unprimeable number, because it can be changed into a prime (12215897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7090 + ... + 8642.

It is an arithmetic number, because the mean of its divisors is an integer number (606060).

Almost surely, 2^12215898 is an apocalyptic number.

12215898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12215898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14545440).

12215898 is an abundant number, since it is smaller than the sum of its proper divisors (16874982).

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

12215898 is a wasteful number, since it uses less digits than its factorization.

12215898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603 (or 1600 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 12215898 is about 3495.1248904724. The cubic root of 12215898 is about 230.3077040984.

The spelling of 12215898 in words is "twelve million, two hundred fifteen thousand, eight hundred ninety-eight".