18930321 has 16 divisors (see below), whose sum is σ = 28195200. Its totient is φ = 12552624.

The previous prime is 18930319. The next prime is 18930341. The reversal of 18930321 is 12303981.

It is not a de Polignac number, because 18930321 - 2¹ = 18930319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18930341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3540 + ... + 7098.

It is an arithmetic number, because the mean of its divisors is an integer number (1762200).

Almost surely, 2^18930321 is an apocalyptic number.

It is an amenable number.

18930321 is a deficient number, since it is larger than the sum of its proper divisors (9264879).

18930321 is a wasteful number, since it uses less digits than its factorization.

18930321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3765 (or 3759 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 18930321 is about 4350.8988726469. The cubic root of 18930321 is about 266.5135695869.

The spelling of 18930321 in words is "eighteen million, nine hundred thirty thousand, three hundred twenty-one".