18328945 has 8 divisors (see below), whose sum is σ = 22090536. Its totient is φ = 14599296.

The previous prime is 18328943. The next prime is 18328951. The reversal of 18328945 is 54982381.

It can be written as a sum of positive squares in 4 ways, for example, as 78961 + 18249984 = 281^2 + 4272^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18328945 - 2¹ = 18328943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18328898 and 18328907.

It is not an unprimeable number, because it can be changed into a prime (18328943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6702 + ... + 9031.

It is an arithmetic number, because the mean of its divisors is an integer number (2761317).

Almost surely, 2^18328945 is an apocalyptic number.

It is an amenable number.

18328945 is a deficient number, since it is larger than the sum of its proper divisors (3761591).

18328945 is a wasteful number, since it uses less digits than its factorization.

18328945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15971.

The product of its digits is 69120, while the sum is 40.

The square root of 18328945 is about 4281.2317152894. The cubic root of 18328945 is about 263.6609561428.

The spelling of 18328945 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred forty-five".