218434838 has 4 divisors (see below), whose sum is σ = 327652260. Its totient is φ = 109217418.

The previous prime is 218434823. The next prime is 218434859. The reversal of 218434838 is 838434812.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 218434795 and 218434804.

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 as a sum of consecutive naturals, namely, 54608708 + ... + 54608711.

It is an arithmetic number, because the mean of its divisors is an integer number (81913065).

Almost surely, 2^218434838 is an apocalyptic number.

218434838 is a deficient number, since it is larger than the sum of its proper divisors (109217422).

218434838 is a wasteful number, since it uses less digits than its factorization.

218434838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109217421.

The product of its digits is 147456, while the sum is 41.

The square root of 218434838 is about 14779.5411972091. The cubic root of 218434838 is about 602.2460611535.

The spelling of 218434838 in words is "two hundred eighteen million, four hundred thirty-four thousand, eight hundred thirty-eight".