18045549 has 6 divisors (see below), whose sum is σ = 26065806. Its totient is φ = 12030360.

The previous prime is 18045541. The next prime is 18045553. The reversal of 18045549 is 94554081.

It can be written as a sum of positive squares in only one way, i.e., 15069924 + 2975625 = 3882^2 + 1725^2 .

It is not a de Polignac number, because 18045549 - 2³ = 18045541 is a prime.

It is a super-2 number, since 2×18045549² = 651283677422802, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18045541) 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 5 ways as a sum of consecutive naturals, for example, 1002522 + ... + 1002539.

It is an arithmetic number, because the mean of its divisors is an integer number (4344301).

Almost surely, 2^18045549 is an apocalyptic number.

It is an amenable number.

18045549 is a deficient number, since it is larger than the sum of its proper divisors (8020257).

18045549 is a wasteful number, since it uses less digits than its factorization.

18045549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2005067 (or 2005064 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 18045549 is about 4248.0052966069. The cubic root of 18045549 is about 262.2950127555.

The spelling of 18045549 in words is "eighteen million, forty-five thousand, five hundred forty-nine".