218742830 has 16 divisors (see below), whose sum is σ = 393951600. Its totient is φ = 87449472.

The previous prime is 218742829. The next prime is 218742847. The reversal of 218742830 is 38247812.

It is a Curzon number.

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 7 ways as a sum of consecutive naturals, for example, 17846 + ... + 27494.

It is an arithmetic number, because the mean of its divisors is an integer number (24621975).

Almost surely, 2^218742830 is an apocalyptic number.

218742830 is a deficient number, since it is larger than the sum of its proper divisors (175208770).

218742830 is a wasteful number, since it uses less digits than its factorization.

218742830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11923.

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 218742830 is about 14789.9570655225. The cubic root of 218742830 is about 602.5289828404.

The spelling of 218742830 in words is "two hundred eighteen million, seven hundred forty-two thousand, eight hundred thirty".