218860434 has 128 divisors (see below), whose sum is σ = 551577600. Its totient is φ = 63866880.

The previous prime is 218860427. The next prime is 218860463. The reversal of 218860434 is 434068812.

218860434 is a `hidden beast` number, since 2 + 18 + 8 + 604 + 34 = 666.

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 63 ways as a sum of consecutive naturals, for example, 1936762 + ... + 1936874.

It is an arithmetic number, because the mean of its divisors is an integer number (4309200).

Almost surely, 2^218860434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 218860434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275788800).

218860434 is an abundant number, since it is smaller than the sum of its proper divisors (332717166).

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

218860434 is a wasteful number, since it uses less digits than its factorization.

218860434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 218860434 is about 14793.9323372794. The cubic root of 218860434 is about 602.6369439004.

The spelling of 218860434 in words is "two hundred eighteen million, eight hundred sixty thousand, four hundred thirty-four".