218538030 has 24 divisors (see below), whose sum is σ = 524685672. Its totient is φ = 58255216.

The previous prime is 218538029. The next prime is 218538049. The reversal of 218538030 is 30835812.

It is a happy number.

218538030 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 79621 + ... + 82319.

It is an arithmetic number, because the mean of its divisors is an integer number (21861903).

Almost surely, 2^218538030 is an apocalyptic number.

218538030 is an abundant number, since it is smaller than the sum of its proper divisors (306147642).

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

218538030 is an frugal number, since it uses more digits than its factorization.

218538030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5408 (or 2709 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 218538030 is about 14783.0318270644. The cubic root of 218538030 is about 602.3408830118.

Multiplying 218538030 by its sum of digits (30), we get a square (6556140900 = 80970²).

218538030 divided by its sum of digits (30) gives a square (7284601 = 2699²).

The spelling of 218538030 in words is "two hundred eighteen million, five hundred thirty-eight thousand, thirty".