18169145 has 8 divisors (see below), whose sum is σ = 21840840. Its totient is φ = 14510080.

The previous prime is 18169133. The next prime is 18169147. The reversal of 18169145 is 54196181.

It can be written as a sum of positive squares in 4 ways, for example, as 3013696 + 15155449 = 1736^2 + 3893^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18169145 - 2⁸ = 18168889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18169147) 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 in 7 ways as a sum of consecutive naturals, for example, 371 + ... + 6039.

It is an arithmetic number, because the mean of its divisors is an integer number (2730105).

Almost surely, 2^18169145 is an apocalyptic number.

It is an amenable number.

18169145 is a deficient number, since it is larger than the sum of its proper divisors (3671695).

18169145 is an equidigital number, since it uses as much as digits as its factorization.

18169145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6315.

The product of its digits is 8640, while the sum is 35.

The square root of 18169145 is about 4262.5280057731. The cubic root of 18169145 is about 262.8924801573.

The spelling of 18169145 in words is "eighteen million, one hundred sixty-nine thousand, one hundred forty-five".