1218331140 has 144 divisors (see below), whose sum is σ = 3765279168. Its totient is φ = 294108672.

The previous prime is 1218331117. The next prime is 1218331157. The reversal of 1218331140 is 411338121.

It is a self number, because there is not a number n which added to its sum of digits gives 1218331140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 536287 + ... + 538553.

It is an arithmetic number, because the mean of its divisors is an integer number (26147772).

Almost surely, 2^1218331140 is an apocalyptic number.

1218331140 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 1218331140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1882639584).

1218331140 is an abundant number, since it is smaller than the sum of its proper divisors (2546948028).

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

1218331140 is a wasteful number, since it uses less digits than its factorization.

1218331140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358 (or 2343 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1218331140 is about 34904.6005563737. The cubic root of 1218331140 is about 1068.0422874586.

Adding to 1218331140 its reverse (411338121), we get a palindrome (1629669261).

The spelling of 1218331140 in words is "one billion, two hundred eighteen million, three hundred thirty-one thousand, one hundred forty".