1998983 has 4 divisors (see below), whose sum is σ = 2284560. Its totient is φ = 1713408.

The previous prime is 1998977. The next prime is 1998991. The reversal of 1998983 is 3898991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1998983 - 2⁸ = 1998727 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 (1998923) 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, 142778 + ... + 142791.

It is an arithmetic number, because the mean of its divisors is an integer number (571140).

2^1998983 is an apocalyptic number.

1998983 is a deficient number, since it is larger than the sum of its proper divisors (285577).

1998983 is an equidigital number, since it uses as much as digits as its factorization.

1998983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285576.

The product of its digits is 139968, while the sum is 47.

The square root of 1998983 is about 1413.8539528537. The cubic root of 1998983 is about 125.9707457069.

The spelling of 1998983 in words is "one million, nine hundred ninety-eight thousand, nine hundred eighty-three".