17998013 has 8 divisors (see below), whose sum is σ = 19672896. Its totient is φ = 16329600.

The previous prime is 17997977. The next prime is 17998027. The reversal of 17998013 is 31089971.

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 17998013 - 2¹² = 17993917 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 (17998033) by changing a digit.

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, 5645 + ... + 8237.

It is an arithmetic number, because the mean of its divisors is an integer number (2459112).

Almost surely, 2^17998013 is an apocalyptic number.

It is an amenable number.

17998013 is a deficient number, since it is larger than the sum of its proper divisors (1674883).

17998013 is a wasteful number, since it uses less digits than its factorization.

17998013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3235.

The product of its (nonzero) digits is 13608, while the sum is 38.

The square root of 17998013 is about 4242.4065104608. The cubic root of 17998013 is about 262.0644957083.

The spelling of 17998013 in words is "seventeen million, nine hundred ninety-eight thousand, thirteen".