983999 has 4 divisors (see below), whose sum is σ = 1017960. Its totient is φ = 950040.

The previous prime is 983993. The next prime is 984007. The reversal of 983999 is 999389.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-983999 is a prime.

It is a Duffinian number.

983999 is a modest number, since divided by 999 gives 983 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (983993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16937 + ... + 16994.

It is an arithmetic number, because the mean of its divisors is an integer number (254490).

2⁹⁸³⁹⁹⁹ is an apocalyptic number.

983999 is a deficient number, since it is larger than the sum of its proper divisors (33961).

983999 is a wasteful number, since it uses less digits than its factorization.

983999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33960.

The product of its digits is 157464, while the sum is 47.

The square root of 983999 is about 991.9672373622. The cubic root of 983999 is about 99.4637629717.

The spelling of 983999 in words is "nine hundred eighty-three thousand, nine hundred ninety-nine".