1005999999 has 8 divisors (see below), whose sum is σ = 1341553920. Its totient is φ = 670556376.

The previous prime is 1005999997. The next prime is 1006000001. The reversal of 1005999999 is 9999995001.

It is an interprime number because it is at equal distance from previous prime (1005999997) and next prime (1006000001).

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

It is not a de Polignac number, because 1005999999 - 2¹ = 1005999997 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

1005999999 is a modest number, since divided by 99999 gives 10059 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005999997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3217 + ... + 44970.

It is an arithmetic number, because the mean of its divisors is an integer number (167694240).

Almost surely, 2^1005999999 is an apocalyptic number.

1005999999 is a deficient number, since it is larger than the sum of its proper divisors (335553921).

1005999999 is an equidigital number, since it uses as much as digits as its factorization.

1005999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55149.

The product of its (nonzero) digits is 2657205, while the sum is 60.

The square root of 1005999999 is about 31717.5030385432. The cubic root of 1005999999 is about 1001.9960129482.

The spelling of 1005999999 in words is "one billion, five million, nine hundred ninety-nine thousand, nine hundred ninety-nine".