18945544 has 16 divisors (see below), whose sum is σ = 36010620. Its totient is φ = 9342720.

The previous prime is 18945541. The next prime is 18945547. The reversal of 18945544 is 44554981.

It is an interprime number because it is at equal distance from previous prime (18945541) and next prime (18945547).

It can be written as a sum of positive squares in 2 ways, for example, as 17123044 + 1822500 = 4138^2 + 1350^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18945497 and 18945506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18945541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15637 + ... + 16804.

Almost surely, 2^18945544 is an apocalyptic number.

It is an amenable number.

18945544 is a deficient number, since it is larger than the sum of its proper divisors (17065076).

18945544 is a wasteful number, since it uses less digits than its factorization.

18945544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32520 (or 32516 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 18945544 is about 4352.6479297090. The cubic root of 18945544 is about 266.5849902640.

The spelling of 18945544 in words is "eighteen million, nine hundred forty-five thousand, five hundred forty-four".