12218040 has 112 divisors (see below), whose sum is σ = 41315400. Its totient is φ = 3250368.

The previous prime is 12218033. The next prime is 12218051. The reversal of 12218040 is 4081221.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 28951 + ... + 29369.

Almost surely, 2^12218040 is an apocalyptic number.

12218040 is a gapful number since it is divisible by the number (10) 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 12218040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20657700).

12218040 is an abundant number, since it is smaller than the sum of its proper divisors (29097360).

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

12218040 is an equidigital number, since it uses as much as digits as its factorization.

12218040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448 (or 429 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 12218040 is about 3495.4313038594. The cubic root of 12218040 is about 230.3211644343.

Adding to 12218040 its reverse (4081221), we get a palindrome (16299261).

It can be divided in two parts, 1221 and 8040, that added together give a cube (9261 = 21³).

The spelling of 12218040 in words is "twelve million, two hundred eighteen thousand, forty".