218933430 has 16 divisors (see below), whose sum is σ = 525440304. Its totient is φ = 58382240.

The previous prime is 218933423. The next prime is 218933431. The reversal of 218933430 is 34339812.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 218933391 and 218933400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218933431) 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, 3648861 + ... + 3648920.

It is an arithmetic number, because the mean of its divisors is an integer number (32840019).

Almost surely, 2^218933430 is an apocalyptic number.

218933430 is an abundant number, since it is smaller than the sum of its proper divisors (306506874).

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

218933430 is a wasteful number, since it uses less digits than its factorization.

218933430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7297791.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 218933430 is about 14796.3992241356. The cubic root of 218933430 is about 602.7039351420.

The spelling of 218933430 in words is "two hundred eighteen million, nine hundred thirty-three thousand, four hundred thirty".