1218162788 has 6 divisors (see below), whose sum is σ = 2131784886. Its totient is φ = 609081392.

The previous prime is 1218162739. The next prime is 1218162809. The reversal of 1218162788 is 8872618121.

It can be written as a sum of positive squares in only one way, i.e., 878055424 + 340107364 = 29632^2 + 18442^2 .

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 as a sum of consecutive naturals, namely, 152270345 + ... + 152270352.

It is an arithmetic number, because the mean of its divisors is an integer number (355297481).

Almost surely, 2^1218162788 is an apocalyptic number.

It is an amenable number.

1218162788 is a deficient number, since it is larger than the sum of its proper divisors (913622098).

1218162788 is a wasteful number, since it uses less digits than its factorization.

1218162788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304540701 (or 304540699 counting only the distinct ones).

The product of its digits is 86016, while the sum is 44.

The square root of 1218162788 is about 34902.1888711869. The cubic root of 1218162788 is about 1067.9930902871.

The spelling of 1218162788 in words is "one billion, two hundred eighteen million, one hundred sixty-two thousand, seven hundred eighty-eight".