1218955776 has 40 divisors (see below), whose sum is σ = 3247378464. Its totient is φ = 406318080.

The previous prime is 1218955757. The next prime is 1218955781. The reversal of 1218955776 is 6775598121.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 395260 + ... + 398331.

Almost surely, 2^1218955776 is an apocalyptic number.

1218955776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1218955776 is an abundant number, since it is smaller than the sum of its proper divisors (2028422688).

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

1218955776 is an frugal number, since it uses more digits than its factorization.

1218955776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793612 (or 793596 counting only the distinct ones).

The product of its digits is 1058400, while the sum is 51.

The square root of 1218955776 is about 34913.5471701172. The cubic root of 1218955776 is about 1068.2247840064.

The spelling of 1218955776 in words is "one billion, two hundred eighteen million, nine hundred fifty-five thousand, seven hundred seventy-six".