12218890 has 16 divisors (see below), whose sum is σ = 22209408. Its totient is φ = 4839696.

The previous prime is 12218873. The next prime is 12218891. The reversal of 12218890 is 9881221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12218891) 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 7 ways as a sum of consecutive naturals, for example, 4902 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (1388088).

Almost surely, 2^12218890 is an apocalyptic number.

12218890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12218890 is a deficient number, since it is larger than the sum of its proper divisors (9990518).

12218890 is a wasteful number, since it uses less digits than its factorization.

12218890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11973.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 12218890 is about 3495.5528890291. The cubic root of 12218890 is about 230.3265054014.

The spelling of 12218890 in words is "twelve million, two hundred eighteen thousand, eight hundred ninety".