1218184280 has 16 divisors (see below), whose sum is σ = 2740914720. Its totient is φ = 487273696.

The previous prime is 1218184267. The next prime is 1218184313. The reversal of 1218184280 is 824818121.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218184280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15227264 + ... + 15227343.

It is an arithmetic number, because the mean of its divisors is an integer number (171307170).

Almost surely, 2^1218184280 is an apocalyptic number.

1218184280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218184280 is an abundant number, since it is smaller than the sum of its proper divisors (1522730440).

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

1218184280 is a wasteful number, since it uses less digits than its factorization.

1218184280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30454618 (or 30454614 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 35.

The square root of 1218184280 is about 34902.4967588280. The cubic root of 1218184280 is about 1067.9993711041. Note that the first 3 decimals are identical.

The spelling of 1218184280 in words is "one billion, two hundred eighteen million, one hundred eighty-four thousand, two hundred eighty".