218638214 has 8 divisors (see below), whose sum is σ = 330461208. Its totient is φ = 108484480.

The previous prime is 218638177. The next prime is 218638223. The reversal of 218638214 is 412836812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×218638214² = 95605337242219592, which contains 22 as substring.

It is a Curzon number.

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 in 3 ways as a sum of consecutive naturals, for example, 416987 + ... + 417510.

It is an arithmetic number, because the mean of its divisors is an integer number (41307651).

Almost surely, 2^218638214 is an apocalyptic number.

218638214 is a deficient number, since it is larger than the sum of its proper divisors (111822994).

218638214 is a wasteful number, since it uses less digits than its factorization.

218638214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834630.

The product of its digits is 18432, while the sum is 35.

The square root of 218638214 is about 14786.4199182899. The cubic root of 218638214 is about 602.4329123031.

The spelling of 218638214 in words is "two hundred eighteen million, six hundred thirty-eight thousand, two hundred fourteen".