18985093 has 2 divisors, whose sum is σ = 18985094. Its totient is φ = 18985092.

The previous prime is 18985081. The next prime is 18985157. The reversal of 18985093 is 39058981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17623204 + 1361889 = 4198^2 + 1167^2 .

It is a cyclic number.

It is not a de Polignac number, because 18985093 - 2¹³ = 18976901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18985003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9492546 + 9492547.

It is an arithmetic number, because the mean of its divisors is an integer number (9492547).

Almost surely, 2^18985093 is an apocalyptic number.

It is an amenable number.

18985093 is a deficient number, since it is larger than the sum of its proper divisors (1).

18985093 is an equidigital number, since it uses as much as digits as its factorization.

18985093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 18985093 is about 4357.1886578389. The cubic root of 18985093 is about 266.7703608882.

The spelling of 18985093 in words is "eighteen million, nine hundred eighty-five thousand, ninety-three".