218898993 has 12 divisors (see below), whose sum is σ = 299972400. Its totient is φ = 141985872.

The previous prime is 218898941. The next prime is 218898997. The reversal of 218898993 is 399898812.

It is not a de Polignac number, because 218898993 - 2⁶ = 218898929 is a prime.

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 in 11 ways as a sum of consecutive naturals, for example, 22543 + ... + 30756.

It is an arithmetic number, because the mean of its divisors is an integer number (24997700).

Almost surely, 2^218898993 is an apocalyptic number.

It is an amenable number.

218898993 is a deficient number, since it is larger than the sum of its proper divisors (81073407).

218898993 is an equidigital number, since it uses as much as digits as its factorization.

218898993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53376 (or 53339 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 57.

The square root of 218898993 is about 14795.2354830871. The cubic root of 218898993 is about 602.6723328360.

The spelling of 218898993 in words is "two hundred eighteen million, eight hundred ninety-eight thousand, nine hundred ninety-three".