12219138 has 24 divisors (see below), whose sum is σ = 27092208. Its totient is φ = 3978072.

The previous prime is 12219133. The next prime is 12219157. The reversal of 12219138 is 83191221.

It is not an unprimeable number, because it can be changed into a prime (12219133) 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, 7120 + ... + 8667.

It is an arithmetic number, because the mean of its divisors is an integer number (1128842).

Almost surely, 2^12219138 is an apocalyptic number.

12219138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12219138 is an abundant number, since it is smaller than the sum of its proper divisors (14873070).

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

12219138 is a wasteful number, since it uses less digits than its factorization.

12219138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15838 (or 15835 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 12219138 is about 3495.5883624935. The cubic root of 12219138 is about 230.3280636605.

The spelling of 12219138 in words is "twelve million, two hundred nineteen thousand, one hundred thirty-eight".