999999983 has 4 divisors (see below), whose sum is σ = 1002967680. Its totient is φ = 997032288.

The previous prime is 999999937. The next prime is 1000000007. The reversal of 999999983 is 389999999.

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 999999983 - 2¹⁰ = 999998959 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999999983.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999883) 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, 1483343 + ... + 1484016.

It is an arithmetic number, because the mean of its divisors is an integer number (250741920).

Almost surely, 2^999999983 is an apocalyptic number.

999999983 is a deficient number, since it is larger than the sum of its proper divisors (2967697).

999999983 is a wasteful number, since it uses less digits than its factorization.

999999983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967696.

The product of its digits is 114791256, while the sum is 74.

The square root of 999999983 is about 31622.7763328902. The cubic root of 999999983 is about 999.9999943333. Note that the first 5 decimals are identical.

It can be divided in two parts, 99999998 and 3, that added together give a palindrome (100000001).

The spelling of 999999983 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-three".