17998985 has 8 divisors (see below), whose sum is σ = 22735680. Its totient is φ = 13641264.

The previous prime is 17998973. The next prime is 17998993. The reversal of 17998985 is 58989971.

It is a happy number.

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 17998985 - 2⁶ = 17998921 is a prime.

It is a super-2 number, since 2×17998985² = 647926922060450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 17998985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94637 + ... + 94826.

It is an arithmetic number, because the mean of its divisors is an integer number (2841960).

Almost surely, 2^17998985 is an apocalyptic number.

It is an amenable number.

17998985 is a deficient number, since it is larger than the sum of its proper divisors (4736695).

17998985 is a wasteful number, since it uses less digits than its factorization.

17998985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189487.

The product of its digits is 1632960, while the sum is 56.

The square root of 17998985 is about 4242.5210665358. The cubic root of 17998985 is about 262.0692133051.

The spelling of 17998985 in words is "seventeen million, nine hundred ninety-eight thousand, nine hundred eighty-five".