218442831 has 8 divisors (see below), whose sum is σ = 291485184. Its totient is φ = 145514520.

The previous prime is 218442827. The next prime is 218442853. The reversal of 218442831 is 138244812.

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

It is not a de Polignac number, because 218442831 - 2² = 218442827 is a prime.

It is a super-2 number, since 2×218442831² = 95434540830589122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 218442792 and 218442801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218442811) 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, 23935 + ... + 31776.

It is an arithmetic number, because the mean of its divisors is an integer number (36435648).

Almost surely, 2^218442831 is an apocalyptic number.

218442831 is a deficient number, since it is larger than the sum of its proper divisors (73042353).

218442831 is a wasteful number, since it uses less digits than its factorization.

218442831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57021.

The product of its digits is 12288, while the sum is 33.

The square root of 218442831 is about 14779.8116023175. The cubic root of 218442831 is about 602.2534068897.

The spelling of 218442831 in words is "two hundred eighteen million, four hundred forty-two thousand, eight hundred thirty-one".