218422 has 4 divisors (see below), whose sum is σ = 327636. Its totient is φ = 109210.

The previous prime is 218419. The next prime is 218423. The reversal of 218422 is 224812.

218422 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 218422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54604 + ... + 54607.

It is an arithmetic number, because the mean of its divisors is an integer number (81909).

2²¹⁸⁴²² is an apocalyptic number.

218422 is a deficient number, since it is larger than the sum of its proper divisors (109214).

218422 is a wasteful number, since it uses less digits than its factorization.

218422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109213.

The product of its digits is 256, while the sum is 19.

The square root of 218422 is about 467.3563950563. The cubic root of 218422 is about 60.2234262385.

The spelling of 218422 in words is "two hundred eighteen thousand, four hundred twenty-two".