218997 has 8 divisors (see below), whose sum is σ = 324480. Its totient is φ = 145980.

The previous prime is 218993. The next prime is 219001. The reversal of 218997 is 799812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (218993) and next prime (219001).

It is not a de Polignac number, because 218997 - 2² = 218993 is a prime.

218997 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218993) 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, 4029 + ... + 4082.

It is an arithmetic number, because the mean of its divisors is an integer number (40560).

2²¹⁸⁹⁹⁷ is an apocalyptic number.

218997 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

218997 is a deficient number, since it is larger than the sum of its proper divisors (105483).

218997 is an equidigital number, since it uses as much as digits as its factorization.

218997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8120 (or 8114 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 218997 is about 467.9711529571. The cubic root of 218997 is about 60.2762263651.

The spelling of 218997 in words is "two hundred eighteen thousand, nine hundred ninety-seven".