17989993 has 8 divisors (see below), whose sum is σ = 20617280. Its totient is φ = 15377040.

The previous prime is 17989987. The next prime is 17989999. The reversal of 17989993 is 39998971.

It is an interprime number because it is at equal distance from previous prime (17989987) and next prime (17989999).

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

It is a de Polignac number, because none of the positive numbers 2^k-17989993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17989999) 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, 738 + ... + 6043.

It is an arithmetic number, because the mean of its divisors is an integer number (2577160).

Almost surely, 2^17989993 is an apocalyptic number.

It is an amenable number.

17989993 is a deficient number, since it is larger than the sum of its proper divisors (2627287).

17989993 is an equidigital number, since it uses as much as digits as its factorization.

17989993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7167.

The product of its digits is 1102248, while the sum is 55.

The square root of 17989993 is about 4241.4611869025. The cubic root of 17989993 is about 262.0255641975.

The spelling of 17989993 in words is "seventeen million, nine hundred eighty-nine thousand, nine hundred ninety-three".