218943197 has 8 divisors (see below), whose sum is σ = 242212032. Its totient is φ = 196235200.

The previous prime is 218943181. The next prime is 218943199. The reversal of 218943197 is 791349812.

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

It is a cyclic number.

It is not a de Polignac number, because 218943197 - 2⁴ = 218943181 is a prime.

It is a super-2 number, since 2×218943197² = 95872247025161618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218943199) 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, 139388 + ... + 140949.

It is an arithmetic number, because the mean of its divisors is an integer number (30276504).

Almost surely, 2^218943197 is an apocalyptic number.

It is an amenable number.

218943197 is a deficient number, since it is larger than the sum of its proper divisors (23268835).

218943197 is a wasteful number, since it uses less digits than its factorization.

218943197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280419.

The product of its digits is 108864, while the sum is 44.

The square root of 218943197 is about 14796.7292669698. The cubic root of 218943197 is about 602.7128975647.

The spelling of 218943197 in words is "two hundred eighteen million, nine hundred forty-three thousand, one hundred ninety-seven".