218420852 has 12 divisors (see below), whose sum is σ = 411639396. Its totient is φ = 100809600.

The previous prime is 218420831. The next prime is 218420893. The reversal of 218420852 is 258024812.

It can be written as a sum of positive squares in 2 ways, for example, as 87684496 + 130736356 = 9364^2 + 11434^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2100149 + ... + 2100252.

It is an arithmetic number, because the mean of its divisors is an integer number (34303283).

Almost surely, 2^218420852 is an apocalyptic number.

It is an amenable number.

218420852 is a deficient number, since it is larger than the sum of its proper divisors (193218544).

218420852 is a wasteful number, since it uses less digits than its factorization.

218420852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200418 (or 4200416 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 32.

The square root of 218420852 is about 14779.0680355698. The cubic root of 218420852 is about 602.2332072925.

The spelling of 218420852 in words is "two hundred eighteen million, four hundred twenty thousand, eight hundred fifty-two".