218330390 has 8 divisors (see below), whose sum is σ = 392994720. Its totient is φ = 87332152.

The previous prime is 218330389. The next prime is 218330401. The reversal of 218330390 is 93033812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10916510 + ... + 10916529.

It is an arithmetic number, because the mean of its divisors is an integer number (49124340).

Almost surely, 2^218330390 is an apocalyptic number.

218330390 is a deficient number, since it is larger than the sum of its proper divisors (174664330).

218330390 is a wasteful number, since it uses less digits than its factorization.

218330390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21833046.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 218330390 is about 14776.0072414709. The cubic root of 218330390 is about 602.1500547565.

The spelling of 218330390 in words is "two hundred eighteen million, three hundred thirty thousand, three hundred ninety".