218989897 has 8 divisors (see below), whose sum is σ = 256378752. Its totient is φ = 183127200.

The previous prime is 218989891. The next prime is 218989987. The reversal of 218989897 is 798989812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 218989897 - 2³ = 218989889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (218989891) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 381229 + ... + 381802.

It is an arithmetic number, because the mean of its divisors is an integer number (32047344).

Almost surely, 2^218989897 is an apocalyptic number.

It is an amenable number.

218989897 is a deficient number, since it is larger than the sum of its proper divisors (37388855).

218989897 is an equidigital number, since it uses as much as digits as its factorization.

218989897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763079.

The product of its digits is 5225472, while the sum is 61.

The square root of 218989897 is about 14798.3072342751. The cubic root of 218989897 is about 602.7557468695.

The spelling of 218989897 in words is "two hundred eighteen million, nine hundred eighty-nine thousand, eight hundred ninety-seven".