18943330 has 16 divisors (see below), whose sum is σ = 38969280. Its totient is φ = 6494832.

The previous prime is 18943291. The next prime is 18943357. The reversal of 18943330 is 3334981.

It is a junction number, because it is equal to n+sod(n) for n = 18943292 and 18943301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135240 + ... + 135379.

It is an arithmetic number, because the mean of its divisors is an integer number (2435580).

Almost surely, 2^18943330 is an apocalyptic number.

18943330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18943330 is an abundant number, since it is smaller than the sum of its proper divisors (20025950).

18943330 is a wasteful number, since it uses less digits than its factorization.

18943330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270633.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 18943330 is about 4352.3935943340. The cubic root of 18943330 is about 266.5746053741.

The spelling of 18943330 in words is "eighteen million, nine hundred forty-three thousand, three hundred thirty".