1599999999 has 64 divisors (see below), whose sum is σ = 2495001600. Its totient is φ = 903260160.

The previous prime is 1599999983. The next prime is 1600000009. The reversal of 1599999999 is 9999999951.

It is a Cunningham number, because it is equal to 200⁴-1.

It is not a de Polignac number, because 1599999999 - 2⁴ = 1599999983 is a prime.

1599999999 is a modest number, since divided by 99999 gives 15999 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1599999199) 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 63 ways as a sum of consecutive naturals, for example, 8040102 + ... + 8040300.

It is an arithmetic number, because the mean of its divisors is an integer number (38984400).

Almost surely, 2^1599999999 is an apocalyptic number.

1599999999 is a deficient number, since it is larger than the sum of its proper divisors (895001601).

1599999999 is a wasteful number, since it uses less digits than its factorization.

1599999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480.

The product of its digits is 215233605, while the sum is 78.

The square root of 1599999999 is about 39999.9999875000. Note that the first 4 decimals coincide. The cubic root of 1599999999 is about 1169.6070950415.

The spelling of 1599999999 in words is "one billion, five hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".