218898994 has 4 divisors (see below), whose sum is σ = 328348494. Its totient is φ = 109449496.

The previous prime is 218898941. The next prime is 218898997. The reversal of 218898994 is 499898812.

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., 213539769 + 5359225 = 14613^2 + 2315^2 .

It is not an unprimeable number, because it can be changed into a prime (218898997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54724747 + ... + 54724750.

Almost surely, 2^218898994 is an apocalyptic number.

218898994 is a deficient number, since it is larger than the sum of its proper divisors (109449500).

218898994 is a wasteful number, since it uses less digits than its factorization.

218898994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109449499.

The product of its digits is 2985984, while the sum is 58.

The square root of 218898994 is about 14795.2355168818. The cubic root of 218898994 is about 602.6723337537.

The spelling of 218898994 in words is "two hundred eighteen million, eight hundred ninety-eight thousand, nine hundred ninety-four".