218803540 has 24 divisors (see below), whose sum is σ = 465962112. Its totient is φ = 86288160.

The previous prime is 218803517. The next prime is 218803547. The reversal of 218803540 is 45308812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218803547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75624 + ... + 78463.

It is an arithmetic number, because the mean of its divisors is an integer number (19415088).

Almost surely, 2^218803540 is an apocalyptic number.

218803540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218803540 is an abundant number, since it is smaller than the sum of its proper divisors (247158572).

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

218803540 is a wasteful number, since it uses less digits than its factorization.

218803540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154167 (or 154165 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 218803540 is about 14792.0093293643. The cubic root of 218803540 is about 602.5847197545.

The spelling of 218803540 in words is "two hundred eighteen million, eight hundred three thousand, five hundred forty".