218742 has 8 divisors (see below), whose sum is σ = 437496. Its totient is φ = 72912.

The previous prime is 218737. The next prime is 218749. The reversal of 218742 is 247812.

218742 is nontrivially palindromic in base 5.

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

218742 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18223 + ... + 18234.

It is an arithmetic number, because the mean of its divisors is an integer number (54687).

2²¹⁸⁷⁴² is an apocalyptic number.

218742 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

218742 is a wasteful number, since it uses less digits than its factorization.

218742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36462.

The product of its digits is 896, while the sum is 24.

The square root of 218742 is about 467.6986209088. The cubic root of 218742 is about 60.2528220759.

The spelling of 218742 in words is "two hundred eighteen thousand, seven hundred forty-two".