218488 has 16 divisors (see below), whose sum is σ = 423360. Its totient is φ = 105600.

The previous prime is 218479. The next prime is 218509. The reversal of 218488 is 884812.

It is a super-2 number, since 2×218488² = 95474012288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a nude number because it is divisible by every one of its digits.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

218488 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193 + ... + 688.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

218488 is a Friedman number, since it can be written as 881*248, using all its digits and the basic arithmetic operations.

It is a vampire number, since it can be written as 248 ⋅ 881 (with its own digits).

2²¹⁸⁴⁸⁸ is an apocalyptic number.

It is an amenable number.

218488 is a deficient number, since it is larger than the sum of its proper divisors (204872).

218488 is a wasteful number, since it uses less digits than its factorization.

218488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 918 (or 914 counting only the distinct ones).

The product of its digits is 4096, while the sum is 31.

The square root of 218488 is about 467.4269996481. The cubic root of 218488 is about 60.2294914789.

The spelling of 218488 in words is "two hundred eighteen thousand, four hundred eighty-eight".