1998863 has 8 divisors (see below), whose sum is σ = 2073600. Its totient is φ = 1925560.

The previous prime is 1998839. The next prime is 1998881. The reversal of 1998863 is 3688991.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991863) 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, 3038 + ... + 3636.

It is an arithmetic number, because the mean of its divisors is an integer number (259200).

2^1998863 is an apocalyptic number.

1998863 is a deficient number, since it is larger than the sum of its proper divisors (74737).

1998863 is an equidigital number, since it uses as much as digits as its factorization.

1998863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717.

The product of its digits is 93312, while the sum is 44.

The square root of 1998863 is about 1413.8115150189. The cubic root of 1998863 is about 125.9682249598.

The spelling of 1998863 in words is "one million, nine hundred ninety-eight thousand, eight hundred sixty-three".