1005999 has 8 divisors (see below), whose sum is σ = 1360512. Its totient is φ = 661080.

The previous prime is 1005989. The next prime is 1006003. The reversal of 1005999 is 9995001.

1005999 is nontrivially palindromic in base 2.

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

It is not a de Polignac number, because 1005999 - 2¹³ = 997807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005959) 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, 2149 + ... + 2574.

It is an arithmetic number, because the mean of its divisors is an integer number (170064).

2^1005999 is an apocalyptic number.

1005999 is a deficient number, since it is larger than the sum of its proper divisors (354513).

1005999 is an equidigital number, since it uses as much as digits as its factorization.

1005999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4797.

The product of its (nonzero) digits is 3645, while the sum is 33.

The square root of 1005999 is about 1002.9950149427. The cubic root of 1005999 is about 100.1995681273.

The spelling of 1005999 in words is "one million, five thousand, nine hundred ninety-nine".