218029918 has 4 divisors (see below), whose sum is σ = 327044880. Its totient is φ = 109014958.

The previous prime is 218029891. The next prime is 218029919. The reversal of 218029918 is 819920812.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218029919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54507478 + ... + 54507481.

It is an arithmetic number, because the mean of its divisors is an integer number (81761220).

Almost surely, 2^218029918 is an apocalyptic number.

218029918 is a deficient number, since it is larger than the sum of its proper divisors (109014962).

218029918 is a wasteful number, since it uses less digits than its factorization.

218029918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109014961.

The product of its (nonzero) digits is 20736, while the sum is 40.

The square root of 218029918 is about 14765.8361767968. The cubic root of 218029918 is about 601.8736963827.

The spelling of 218029918 in words is "two hundred eighteen million, twenty-nine thousand, nine hundred eighteen".