18896321 has 2 divisors, whose sum is σ = 18896322. Its totient is φ = 18896320.

The previous prime is 18896281. The next prime is 18896327. The reversal of 18896321 is 12369881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 4456321 = 3800^2 + 2111^2 .

It is a cyclic number.

It is not a de Polignac number, because 18896321 - 2⁶ = 18896257 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18896327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9448160 + 9448161.

It is an arithmetic number, because the mean of its divisors is an integer number (9448161).

Almost surely, 2^18896321 is an apocalyptic number.

It is an amenable number.

18896321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18896321 is an equidigital number, since it uses as much as digits as its factorization.

18896321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 38.

The square root of 18896321 is about 4346.9898780651. The cubic root of 18896321 is about 266.3539158096.

The spelling of 18896321 in words is "eighteen million, eight hundred ninety-six thousand, three hundred twenty-one".