218909841 has 8 divisors (see below), whose sum is σ = 292137984. Its totient is φ = 145810800.

The previous prime is 218909809. The next prime is 218909857. The reversal of 218909841 is 148909812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218909841 - 2⁵ = 218909809 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 218909793 and 218909802.

It is not an unprimeable number, because it can be changed into a prime (218909881) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 28246 + ... + 35151.

It is an arithmetic number, because the mean of its divisors is an integer number (36517248).

Almost surely, 2^218909841 is an apocalyptic number.

It is an amenable number.

218909841 is a deficient number, since it is larger than the sum of its proper divisors (73228143).

218909841 is a wasteful number, since it uses less digits than its factorization.

218909841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64551.

The product of its (nonzero) digits is 41472, while the sum is 42.

The square root of 218909841 is about 14795.6020830516. The cubic root of 218909841 is about 602.6822882366.

The spelling of 218909841 in words is "two hundred eighteen million, nine hundred nine thousand, eight hundred forty-one".