18973093 has 2 divisors, whose sum is σ = 18973094. Its totient is φ = 18973092.

The previous prime is 18973081. The next prime is 18973151. The reversal of 18973093 is 39037981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17791524 + 1181569 = 4218^2 + 1087^2 .

It is a cyclic number.

It is not a de Polignac number, because 18973093 - 2⁹ = 18972581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18974093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9486546 + 9486547.

It is an arithmetic number, because the mean of its divisors is an integer number (9486547).

Almost surely, 2^18973093 is an apocalyptic number.

It is an amenable number.

18973093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18973093 is an equidigital number, since it uses as much as digits as its factorization.

18973093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 18973093 is about 4355.8114054674. The cubic root of 18973093 is about 266.7141427624.

The spelling of 18973093 in words is "eighteen million, nine hundred seventy-three thousand, ninety-three".