1218324240 has 360 divisors, whose sum is σ = 4939683840. Its totient is φ = 278256384.

The previous prime is 1218324169. The next prime is 1218324241. The reversal of 1218324240 is 424238121.

It is a tau number, because it is divible by the number of its divisors (360).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1218324241) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 951921 + ... + 953199.

It is an arithmetic number, because the mean of its divisors is an integer number (13721344).

Almost surely, 2^1218324240 is an apocalyptic number.

1218324240 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 1218324240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2469841920).

1218324240 is an abundant number, since it is smaller than the sum of its proper divisors (3721359600).

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

1218324240 is a wasteful number, since it uses less digits than its factorization.

1218324240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1218324240 is about 34904.5017153948. The cubic root of 1218324240 is about 1068.0402711743.

The spelling of 1218324240 in words is "one billion, two hundred eighteen million, three hundred twenty-four thousand, two hundred forty".