18389445 has 8 divisors (see below), whose sum is σ = 29423136. Its totient is φ = 9807696.

The previous prime is 18389401. The next prime is 18389453. The reversal of 18389445 is 54498381.

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

It is not a de Polignac number, because 18389445 - 2⁷ = 18389317 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18389397 and 18389406.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 612967 + ... + 612996.

It is an arithmetic number, because the mean of its divisors is an integer number (3677892).

Almost surely, 2^18389445 is an apocalyptic number.

18389445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18389445 is a deficient number, since it is larger than the sum of its proper divisors (11033691).

18389445 is a wasteful number, since it uses less digits than its factorization.

18389445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225971.

The product of its digits is 138240, while the sum is 42.

The square root of 18389445 is about 4288.2916178823. The cubic root of 18389445 is about 263.9507340346.

The spelling of 18389445 in words is "eighteen million, three hundred eighty-nine thousand, four hundred forty-five".