1988863 has 4 divisors (see below), whose sum is σ = 2093560. Its totient is φ = 1884168.

The previous prime is 1988851. The next prime is 1988887. The reversal of 1988863 is 3688891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3688891 = 643 ⋅5737.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1988863 is a prime.

It is a Duffinian number.

1988863 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52320 + ... + 52357.

It is an arithmetic number, because the mean of its divisors is an integer number (523390).

2^1988863 is an apocalyptic number.

1988863 is a deficient number, since it is larger than the sum of its proper divisors (104697).

1988863 is a wasteful number, since it uses less digits than its factorization.

1988863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104696.

The product of its digits is 82944, while the sum is 43.

The square root of 1988863 is about 1410.2705414210. The cubic root of 1988863 is about 125.7578072085.

The spelling of 1988863 in words is "one million, nine hundred eighty-eight thousand, eight hundred sixty-three".