1218857472 has 240 divisors, whose sum is σ = 4162055040. Its totient is φ = 335978496.

The previous prime is 1218857447. The next prime is 1218857527. The reversal of 1218857472 is 2747588121.

1218857472 is a `hidden beast` number, since 1 + 2 + 1 + 8 + 8 + 574 + 72 = 666.

It is a super-2 number, since 2×1218857472² = 2971227074100461568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 934773 + ... + 936075.

It is an arithmetic number, because the mean of its divisors is an integer number (17341896).

Almost surely, 2^1218857472 is an apocalyptic number.

1218857472 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218857472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2081027520).

1218857472 is an abundant number, since it is smaller than the sum of its proper divisors (2943197568).

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

1218857472 is a wasteful number, since it uses less digits than its factorization.

1218857472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363 (or 1344 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The square root of 1218857472 is about 34912.1393214452. The cubic root of 1218857472 is about 1068.1960671887.

The spelling of 1218857472 in words is "one billion, two hundred eighteen million, eight hundred fifty-seven thousand, four hundred seventy-two".