1218869836 has 24 divisors (see below), whose sum is σ = 2305975280. Its totient is φ = 561753792.

The previous prime is 1218869819. The next prime is 1218869881. The reversal of 1218869836 is 6389688121.

It is a super-2 number, since 2×1218869836² = 2971287354221333792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213915 + ... + 219538.

Almost surely, 2^1218869836 is an apocalyptic number.

It is an amenable number.

1218869836 is a deficient number, since it is larger than the sum of its proper divisors (1087105444).

1218869836 is a wasteful number, since it uses less digits than its factorization.

1218869836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433513 (or 433511 counting only the distinct ones).

The product of its digits is 995328, while the sum is 52.

The square root of 1218869836 is about 34912.3163940750. The cubic root of 1218869836 is about 1068.1996790771.

The spelling of 1218869836 in words is "one billion, two hundred eighteen million, eight hundred sixty-nine thousand, eight hundred thirty-six".