218397 has 8 divisors (see below), whose sum is σ = 298144. Its totient is φ = 142128.

The previous prime is 218389. The next prime is 218401. The reversal of 218397 is 793812.

It is a happy number.

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

It is not a de Polignac number, because 218397 - 2³ = 218389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218357) 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, 718 + ... + 975.

It is an arithmetic number, because the mean of its divisors is an integer number (37268).

2²¹⁸³⁹⁷ is an apocalyptic number.

It is an amenable number.

218397 is a deficient number, since it is larger than the sum of its proper divisors (79747).

218397 is a wasteful number, since it uses less digits than its factorization.

218397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1739.

The product of its digits is 3024, while the sum is 30.

The square root of 218397 is about 467.3296481072. The cubic root of 218397 is about 60.2211284799.

The spelling of 218397 in words is "two hundred eighteen thousand, three hundred ninety-seven".