218499994 has 4 divisors (see below), whose sum is σ = 327749994. Its totient is φ = 109249996.

The previous prime is 218499991. The next prime is 218500003. The reversal of 218499994 is 499994812.

218499994 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 can be written as a sum of positive squares in only one way, i.e., 187553025 + 30946969 = 13695^2 + 5563^2 .

It is not an unprimeable number, because it can be changed into a prime (218499991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54624997 + ... + 54625000.

Almost surely, 2^218499994 is an apocalyptic number.

218499994 is a deficient number, since it is larger than the sum of its proper divisors (109250000).

218499994 is a wasteful number, since it uses less digits than its factorization.

218499994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109249999.

The product of its digits is 1679616, while the sum is 55.

The square root of 218499994 is about 14781.7452961415. The cubic root of 218499994 is about 602.3059356739.

The spelling of 218499994 in words is "two hundred eighteen million, four hundred ninety-nine thousand, nine hundred ninety-four".