1218345120 has 288 divisors, whose sum is σ = 4444182288. Its totient is φ = 302874624.

The previous prime is 1218345083. The next prime is 1218345143. The reversal of 1218345120 is 215438121.

1218345120 is a `hidden beast` number, since 12 + 183 + 451 + 20 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 262051344 + 956293776 = 16188^2 + 30924^2 .

It is a tau number, because it is divible by the number of its divisors (288).

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 47 ways as a sum of consecutive naturals, for example, 3843202 + ... + 3843518.

Almost surely, 2^1218345120 is an apocalyptic number.

1218345120 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 1218345120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222091144).

1218345120 is an abundant number, since it is smaller than the sum of its proper divisors (3225837168).

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

1218345120 is a wasteful number, since it uses less digits than its factorization.

1218345120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 501 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 1218345120 is about 34904.8008159336. The cubic root of 1218345120 is about 1068.0463726025.

The spelling of 1218345120 in words is "one billion, two hundred eighteen million, three hundred forty-five thousand, one hundred twenty".