18918345 has 8 divisors (see below), whose sum is σ = 30269376. Its totient is φ = 10089776.

The previous prime is 18918313. The next prime is 18918373. The reversal of 18918345 is 54381981.

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 18918345 - 2⁵ = 18918313 is a prime.

It is a Curzon 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, 630597 + ... + 630626.

It is an arithmetic number, because the mean of its divisors is an integer number (3783672).

Almost surely, 2^18918345 is an apocalyptic number.

18918345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18918345 is a deficient number, since it is larger than the sum of its proper divisors (11351031).

18918345 is a wasteful number, since it uses less digits than its factorization.

18918345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1261231.

The product of its digits is 34560, while the sum is 39.

The square root of 18918345 is about 4349.5223875731. The cubic root of 18918345 is about 266.4573557167.

The spelling of 18918345 in words is "eighteen million, nine hundred eighteen thousand, three hundred forty-five".