18169373 has 2 divisors, whose sum is σ = 18169374. Its totient is φ = 18169372.

The previous prime is 18169363. The next prime is 18169387. The reversal of 18169373 is 37396181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18130564 + 38809 = 4258^2 + 197^2 .

It is an emirp because it is prime and its reverse (37396181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18169373 - 2⁶ = 18169309 is a prime.

It is a super-2 number, since 2×18169373² = 660252230426258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18169363) 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, 9084686 + 9084687.

It is an arithmetic number, because the mean of its divisors is an integer number (9084687).

Almost surely, 2^18169373 is an apocalyptic number.

It is an amenable number.

18169373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18169373 is an equidigital number, since it uses as much as digits as its factorization.

18169373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 18169373 is about 4262.5547503815. The cubic root of 18169373 is about 262.8935798097.

The spelling of 18169373 in words is "eighteen million, one hundred sixty-nine thousand, three hundred seventy-three".