218443970 has 8 divisors (see below), whose sum is σ = 393199164. Its totient is φ = 87377584.

The previous prime is 218443943. The next prime is 218443993. The reversal of 218443970 is 79344812.

It can be written as a sum of positive squares in 2 ways, for example, as 208715809 + 9728161 = 14447^2 + 3119^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10922189 + ... + 10922208.

Almost surely, 2^218443970 is an apocalyptic number.

218443970 is a deficient number, since it is larger than the sum of its proper divisors (174755194).

218443970 is a wasteful number, since it uses less digits than its factorization.

218443970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21844404.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 218443970 is about 14779.8501345582. The cubic root of 218443970 is about 602.2544536402.

The spelling of 218443970 in words is "two hundred eighteen million, four hundred forty-three thousand, nine hundred seventy".