218108140 has 24 divisors (see below), whose sum is σ = 458322480. Its totient is φ = 87187008.

The previous prime is 218108131. The next prime is 218108141. The reversal of 218108140 is 41801812.

It is not an unprimeable number, because it can be changed into a prime (218108141) 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, 43819 + ... + 48541.

It is an arithmetic number, because the mean of its divisors is an integer number (19096770).

Almost surely, 2^218108140 is an apocalyptic number.

218108140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218108140 is an abundant number, since it is smaller than the sum of its proper divisors (240214340).

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

218108140 is a wasteful number, since it uses less digits than its factorization.

218108140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041 (or 7039 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 218108140 is about 14768.4846886876. The cubic root of 218108140 is about 601.9456653057.

Adding to 218108140 its reverse (41801812), we get a palindrome (259909952).

The spelling of 218108140 in words is "two hundred eighteen million, one hundred eight thousand, one hundred forty".