17998668 has 36 divisors (see below), whose sum is σ = 45693648. Its totient is φ = 5973600.

The previous prime is 17998667. The next prime is 17998691. The reversal of 17998668 is 86689971.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (17998667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8518 + ... + 10418.

It is an arithmetic number, because the mean of its divisors is an integer number (1269268).

Almost surely, 2^17998668 is an apocalyptic number.

17998668 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

17998668 is an abundant number, since it is smaller than the sum of its proper divisors (27694980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17998668 is a wasteful number, since it uses less digits than its factorization.

17998668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2174 (or 2169 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 17998668 is about 4242.4837065097. The cubic root of 17998668 is about 262.0676747660.

The spelling of 17998668 in words is "seventeen million, nine hundred ninety-eight thousand, six hundred sixty-eight".