18139073 has 2 divisors, whose sum is σ = 18139074. Its totient is φ = 18139072.

The previous prime is 18139031. The next prime is 18139087. The reversal of 18139073 is 37093181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14010049 + 4129024 = 3743^2 + 2032^2 .

It is a cyclic number.

It is not a de Polignac number, because 18139073 - 2¹⁰ = 18138049 is a prime.

It is not a weakly prime, because it can be changed into another prime (18139003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9069536 + 9069537.

It is an arithmetic number, because the mean of its divisors is an integer number (9069537).

Almost surely, 2^18139073 is an apocalyptic number.

It is an amenable number.

18139073 is a deficient number, since it is larger than the sum of its proper divisors (1).

18139073 is an equidigital number, since it uses as much as digits as its factorization.

18139073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 18139073 is about 4258.9990608123. Note that the first 3 decimals coincide. The cubic root of 18139073 is about 262.7473610870.

The spelling of 18139073 in words is "eighteen million, one hundred thirty-nine thousand, seventy-three".