999983 has 2 divisors, whose sum is σ = 999984. Its totient is φ = 999982.

The previous prime is 999979. The next prime is 1000003. The reversal of 999983 is 389999.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (389999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999983 - 2² = 999979 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499991 + 499992.

It is an arithmetic number, because the mean of its divisors is an integer number (499992).

2⁹⁹⁹⁹⁸³ is an apocalyptic number.

999983 is a deficient number, since it is larger than the sum of its proper divisors (1).

999983 is an equidigital number, since it uses as much as digits as its factorization.

999983 is an odious number, because the sum of its binary digits is odd.

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

The square root of 999983 is about 999.9914999639. The cubic root of 999983 is about 99.9994333301. Note that the first 3 decimals are identical.

It can be divided in two parts, 99998 and 3, that added together give a palindrome (100001).

The spelling of 999983 in words is "nine hundred ninety-nine thousand, nine hundred eighty-three".