218140 has 24 divisors (see below), whose sum is σ = 493920. Its totient is φ = 80448.

The previous prime is 218137. The next prime is 218143. The reversal of 218140 is 41812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (218137) and next prime (218143).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218143) 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, 160 + ... + 679.

It is an arithmetic number, because the mean of its divisors is an integer number (20580).

2²¹⁸¹⁴⁰ is an apocalyptic number.

218140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218140 is an abundant number, since it is smaller than the sum of its proper divisors (275780).

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

218140 is a wasteful number, since it uses less digits than its factorization.

218140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861 (or 859 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 218140 is about 467.0546006625. The cubic root of 218140 is about 60.1974973482.

Adding to 218140 its reverse (41812), we get a palindrome (259952).

The spelling of 218140 in words is "two hundred eighteen thousand, one hundred forty".