218122434 has 24 divisors (see below), whose sum is σ = 473182320. Its totient is φ = 72617688.

The previous prime is 218122403. The next prime is 218122439. The reversal of 218122434 is 434221812.

218122434 is a `hidden beast` number, since 218 + 12 + 2 + 434 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 218122398 and 218122407.

It is not an unprimeable number, because it can be changed into a prime (218122439) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8409 + ... + 22515.

It is an arithmetic number, because the mean of its divisors is an integer number (19715930).

Almost surely, 2^218122434 is an apocalyptic number.

218122434 is an abundant number, since it is smaller than the sum of its proper divisors (255059886).

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

218122434 is a wasteful number, since it uses less digits than its factorization.

218122434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14974 (or 14971 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 218122434 is about 14768.9686166638. The cubic root of 218122434 is about 601.9588147819.

The spelling of 218122434 in words is "two hundred eighteen million, one hundred twenty-two thousand, four hundred thirty-four".