1000999983 has 8 divisors (see below), whose sum is σ = 1334840368. Its totient is φ = 667246464.

The previous prime is 1000999949. The next prime is 1001000027. The reversal of 1000999983 is 3899990001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1000999983 - 2⁹ = 1000999471 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 (1000999913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13191 + ... + 46647.

It is an arithmetic number, because the mean of its divisors is an integer number (166855046).

Almost surely, 2^1000999983 is an apocalyptic number.

1000999983 is a deficient number, since it is larger than the sum of its proper divisors (333840385).

1000999983 is an equidigital number, since it uses as much as digits as its factorization.

1000999983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43433.

The product of its (nonzero) digits is 157464, while the sum is 48.

The square root of 1000999983 is about 31638.5837704534. The cubic root of 1000999983 is about 1000.3332166210. Note that the first 3 decimals are identical.

The spelling of 1000999983 in words is "one billion, nine hundred ninety-nine thousand, nine hundred eighty-three".