218945858 has 4 divisors (see below), whose sum is σ = 328418790. Its totient is φ = 109472928.

The previous prime is 218945833. The next prime is 218945869. The reversal of 218945858 is 858549812.

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

It can be written as a sum of positive squares in only one way, i.e., 212780569 + 6165289 = 14587^2 + 2483^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54736463 + ... + 54736466.

Almost surely, 2^218945858 is an apocalyptic number.

218945858 is a deficient number, since it is larger than the sum of its proper divisors (109472932).

218945858 is a wasteful number, since it uses less digits than its factorization.

218945858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109472931.

The product of its digits is 921600, while the sum is 50.

The square root of 218945858 is about 14796.8191852168. The cubic root of 218945858 is about 602.7153393129.

The spelling of 218945858 in words is "two hundred eighteen million, nine hundred forty-five thousand, eight hundred fifty-eight".