1698 has 8 divisors (see below), whose sum is σ = 3408.
Its totient is φ = 564.
The previous prime is 1697. The next prime is 1699. The reversal of 1698 is 8961.
It is an interprime number because it is at equal distance from previous prime (1697) and next prime (1699).
It is a sphenic number, since it is the product of 3 distinct primes.
1698 is an admirable number.
It is an alternating number because its digits alternate between odd and even.
It is a nialpdrome in base 12.
It is not an unprimeable number, because it can be changed into a prime (1693) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (5) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136 + ... + 147.
It is an arithmetic number, because the mean of its divisors is an integer number (426).
1698 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1704).
1698 is a wasteful number, since it uses less digits than its factorization.
1698 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 288.
The product of its digits is 432, while the sum is 24.
The square root of 1698 is about 41.2067955561.
The cubic root of 1698 is about 11.9301497564.
The spelling of 1698 in words is "one thousand, six hundred ninety-eight".