18920089 has 2 divisors, whose sum is σ = 18920090. Its totient is φ = 18920088.

The previous prime is 18920071. The next prime is 18920101. The reversal of 18920089 is 98002981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16744464 + 2175625 = 4092^2 + 1475^2 .

It is an emirp because it is prime and its reverse (98002981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18920089 - 2¹⁹ = 18395801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18930089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9460044 + 9460045.

It is an arithmetic number, because the mean of its divisors is an integer number (9460045).

Almost surely, 2^18920089 is an apocalyptic number.

It is an amenable number.

18920089 is a deficient number, since it is larger than the sum of its proper divisors (1).

18920089 is an equidigital number, since it uses as much as digits as its factorization.

18920089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 18920089 is about 4349.7228647352. The cubic root of 18920089 is about 266.4655433137.

The spelling of 18920089 in words is "eighteen million, nine hundred twenty thousand, eighty-nine".