218099894 has 24 divisors (see below), whose sum is σ = 341822208. Its totient is φ = 104358240.

The previous prime is 218099887. The next prime is 218099909. The reversal of 218099894 is 498990812.

It is a happy number.

It is a super-2 number, since 2×218099894² = 95135127525622472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 213104 + ... + 214124.

It is an arithmetic number, because the mean of its divisors is an integer number (14242592).

Almost surely, 2^218099894 is an apocalyptic number.

218099894 is a deficient number, since it is larger than the sum of its proper divisors (123722314).

218099894 is a wasteful number, since it uses less digits than its factorization.

218099894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 50.

The square root of 218099894 is about 14768.2055104877. The cubic root of 218099894 is about 601.9380793035.

The spelling of 218099894 in words is "two hundred eighteen million, ninety-nine thousand, eight hundred ninety-four".