218431338 has 16 divisors (see below), whose sum is σ = 445106016. Its totient is φ = 71436560.

The previous prime is 218431337. The next prime is 218431441. The reversal of 218431338 is 833134812.

It is a junction number, because it is equal to n+sod(n) for n = 218431299 and 218431308.

It is not an unprimeable number, because it can be changed into a prime (218431331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343128 + ... + 343763.

It is an arithmetic number, because the mean of its divisors is an integer number (27819126).

Almost surely, 2^218431338 is an apocalyptic number.

218431338 is an abundant number, since it is smaller than the sum of its proper divisors (226674678).

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

218431338 is a wasteful number, since it uses less digits than its factorization.

218431338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686949.

The product of its digits is 13824, while the sum is 33.

The square root of 218431338 is about 14779.4227898115. The cubic root of 218431338 is about 602.2428445231.

The spelling of 218431338 in words is "two hundred eighteen million, four hundred thirty-one thousand, three hundred thirty-eight".