12218940 has 36 divisors (see below), whose sum is σ = 37064664. Its totient is φ = 3258336.

The previous prime is 12218939. The next prime is 12218951. The reversal of 12218940 is 4981221.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 33762 + ... + 34121.

It is an arithmetic number, because the mean of its divisors is an integer number (1029574).

Almost surely, 2^12218940 is an apocalyptic number.

12218940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12218940 is an abundant number, since it is smaller than the sum of its proper divisors (24845724).

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

12218940 is a wasteful number, since it uses less digits than its factorization.

12218940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67898 (or 67893 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 12218940 is about 3495.5600409663. The cubic root of 12218940 is about 230.3268195682.

The spelling of 12218940 in words is "twelve million, two hundred eighteen thousand, nine hundred forty".