218400534 has 48 divisors (see below), whose sum is σ = 517205520. Its totient is φ = 66055680.

The previous prime is 218400521. The next prime is 218400541. The reversal of 218400534 is 435004812.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 218400498 and 218400507.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 192882 + ... + 194010.

It is an arithmetic number, because the mean of its divisors is an integer number (10775115).

Almost surely, 2^218400534 is an apocalyptic number.

218400534 is an abundant number, since it is smaller than the sum of its proper divisors (298804986).

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

218400534 is a wasteful number, since it uses less digits than its factorization.

218400534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2125 (or 2122 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 218400534 is about 14778.3806284721. The cubic root of 218400534 is about 602.2145330166.

The spelling of 218400534 in words is "two hundred eighteen million, four hundred thousand, five hundred thirty-four".