218143484 has 24 divisors (see below), whose sum is σ = 432756240. Its totient is φ = 95382144.

The previous prime is 218143483. The next prime is 218143511. The reversal of 218143484 is 484341812.

It is a super-2 number, since 2×218143484² = 95173159223316512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218143483) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 109409 + ... + 111384.

It is an arithmetic number, because the mean of its divisors is an integer number (18031510).

Almost surely, 2^218143484 is an apocalyptic number.

It is an amenable number.

218143484 is a deficient number, since it is larger than the sum of its proper divisors (214612756).

218143484 is a wasteful number, since it uses less digits than its factorization.

218143484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220829 (or 220827 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 218143484 is about 14769.6812423288. The cubic root of 218143484 is about 601.9781782578.

The spelling of 218143484 in words is "two hundred eighteen million, one hundred forty-three thousand, four hundred eighty-four".