218740 has 12 divisors (see below), whose sum is σ = 459396. Its totient is φ = 87488.

The previous prime is 218737. The next prime is 218749. The reversal of 218740 is 47812.

It can be written as a sum of positive squares in 2 ways, for example, as 155236 + 63504 = 394^2 + 252^2 .

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5449 + ... + 5488.

It is an arithmetic number, because the mean of its divisors is an integer number (38283).

2²¹⁸⁷⁴⁰ is an apocalyptic number.

218740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218740 is an abundant number, since it is smaller than the sum of its proper divisors (240656).

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

218740 is a wasteful number, since it uses less digits than its factorization.

218740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10946 (or 10944 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 218740 is about 467.6964827749. The cubic root of 218740 is about 60.2526384410.

The spelling of 218740 in words is "two hundred eighteen thousand, seven hundred forty".