17999997 has 8 divisors (see below), whose sum is σ = 24027744. Its totient is φ = 11986128.

The previous prime is 17999987. The next prime is 18000041. The reversal of 17999997 is 79999971.

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

It is not a de Polignac number, because 17999997 - 2¹⁰ = 17998973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17999997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17999987) 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, 78 + ... + 6000.

It is an arithmetic number, because the mean of its divisors is an integer number (3003468).

Almost surely, 2^17999997 is an apocalyptic number.

It is an amenable number.

17999997 is a deficient number, since it is larger than the sum of its proper divisors (6027747).

17999997 is a wasteful number, since it uses less digits than its factorization.

17999997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939.

The product of its digits is 2893401, while the sum is 60.

The square root of 17999997 is about 4242.6403335659. The cubic root of 17999997 is about 262.0741248612.

The spelling of 17999997 in words is "seventeen million, nine hundred ninety-nine thousand, nine hundred ninety-seven".