18027945 has 24 divisors (see below), whose sum is σ = 33653256. Its totient is φ = 8875008.

The previous prime is 18027943. The next prime is 18027953. The reversal of 18027945 is 54972081.

It can be written as a sum of positive squares in 4 ways, for example, as 488601 + 17539344 = 699^2 + 4188^2 .

It is not a de Polignac number, because 18027945 - 2¹ = 18027943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18027943) 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 in 23 ways as a sum of consecutive naturals, for example, 14824 + ... + 15993.

It is an arithmetic number, because the mean of its divisors is an integer number (1402219).

Almost surely, 2^18027945 is an apocalyptic number.

18027945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18027945 is a deficient number, since it is larger than the sum of its proper divisors (15625311).

18027945 is a wasteful number, since it uses less digits than its factorization.

18027945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30841 (or 30838 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 18027945 is about 4245.9327597125. The cubic root of 18027945 is about 262.2096926634.

The spelling of 18027945 in words is "eighteen million, twenty-seven thousand, nine hundred forty-five".