218906842 has 16 divisors (see below), whose sum is σ = 409384512. Its totient is φ = 85288320.

The previous prime is 218906833. The next prime is 218906843. The reversal of 218906842 is 248609812.

It is a junction number, because it is equal to n+sod(n) for n = 218906795 and 218906804.

It is not an unprimeable number, because it can be changed into a prime (218906843) 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, 710583 + ... + 710890.

It is an arithmetic number, because the mean of its divisors is an integer number (25586532).

Almost surely, 2^218906842 is an apocalyptic number.

218906842 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

218906842 is a deficient number, since it is larger than the sum of its proper divisors (190477670).

218906842 is a wasteful number, since it uses less digits than its factorization.

218906842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421493.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 218906842 is about 14795.5007350208. The cubic root of 218906842 is about 602.6795360344.

The spelling of 218906842 in words is "two hundred eighteen million, nine hundred six thousand, eight hundred forty-two".