18789073 has 2 divisors, whose sum is σ = 18789074. Its totient is φ = 18789072.

The previous prime is 18789059. The next prime is 18789079. The reversal of 18789073 is 37098781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15429184 + 3359889 = 3928^2 + 1833^2 .

It is a cyclic number.

It is not a de Polignac number, because 18789073 - 2⁵ = 18789041 is a prime.

It is not a weakly prime, because it can be changed into another prime (18789079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9394536 + 9394537.

It is an arithmetic number, because the mean of its divisors is an integer number (9394537).

Almost surely, 2^18789073 is an apocalyptic number.

It is an amenable number.

18789073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18789073 is an equidigital number, since it uses as much as digits as its factorization.

18789073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84672, while the sum is 43.

The square root of 18789073 is about 4334.6364322743. The cubic root of 18789073 is about 265.8490531830.

The spelling of 18789073 in words is "eighteen million, seven hundred eighty-nine thousand, seventy-three".