18830321 has 2 divisors, whose sum is σ = 18830322. Its totient is φ = 18830320.

The previous prime is 18830297. The next prime is 18830347. The reversal of 18830321 is 12303881.

It is an a-pointer prime, because the next prime (18830347) can be obtained adding 18830321 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 3534400 = 3911^2 + 1880^2 .

It is an emirp because it is prime and its reverse (12303881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18830321 - 2⁶ = 18830257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18839321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9415160 + 9415161.

It is an arithmetic number, because the mean of its divisors is an integer number (9415161).

Almost surely, 2^18830321 is an apocalyptic number.

It is an amenable number.

18830321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18830321 is an equidigital number, since it uses as much as digits as its factorization.

18830321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 18830321 is about 4339.3917776573. The cubic root of 18830321 is about 266.0434521135.

The spelling of 18830321 in words is "eighteen million, eight hundred thirty thousand, three hundred twenty-one".