1218783312 has 60 divisors (see below), whose sum is σ = 3611548980. Its totient is φ = 382362624.

The previous prime is 1218783301. The next prime is 1218783331. The reversal of 1218783312 is 2133878121.

It can be written as a sum of positive squares in 2 ways, for example, as 560552976 + 658230336 = 23676^2 + 25656^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 246487 + ... + 251382.

It is an arithmetic number, because the mean of its divisors is an integer number (60192483).

Almost surely, 2^1218783312 is an apocalyptic number.

1218783312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1218783312 is an abundant number, since it is smaller than the sum of its proper divisors (2392765668).

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

1218783312 is a wasteful number, since it uses less digits than its factorization.

1218783312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497900 (or 497891 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 1218783312 is about 34911.0772105359. The cubic root of 1218783312 is about 1068.1744023567.

The spelling of 1218783312 in words is "one billion, two hundred eighteen million, seven hundred eighty-three thousand, three hundred twelve".