18303989 has 8 divisors (see below), whose sum is σ = 20014560. Its totient is φ = 16601200.

The previous prime is 18303979. The next prime is 18304031. The reversal of 18303989 is 98930381.

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

It is not a de Polignac number, because 18303989 - 2¹⁶ = 18238453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18303979) 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, 3707 + ... + 7095.

It is an arithmetic number, because the mean of its divisors is an integer number (2501820).

Almost surely, 2^18303989 is an apocalyptic number.

It is an amenable number.

18303989 is a deficient number, since it is larger than the sum of its proper divisors (1710571).

18303989 is a wasteful number, since it uses less digits than its factorization.

18303989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 18303989 is about 4278.3161407264. The cubic root of 18303989 is about 263.5412381884.

The spelling of 18303989 in words is "eighteen million, three hundred three thousand, nine hundred eighty-nine".