1999904559 has 4 divisors (see below), whose sum is σ = 2666539416. Its totient is φ = 1333269704.

The previous prime is 1999904549. The next prime is 1999904561. The reversal of 1999904559 is 9554099991.

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 1999904559 - 2¹⁵ = 1999871791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999904549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333317424 + ... + 333317429.

It is an arithmetic number, because the mean of its divisors is an integer number (666634854).

Almost surely, 2^1999904559 is an apocalyptic number.

1999904559 is a deficient number, since it is larger than the sum of its proper divisors (666634857).

1999904559 is an equidigital number, since it uses as much as digits as its factorization.

1999904559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666634856.

The product of its (nonzero) digits is 5904900, while the sum is 60.

The square root of 1999904559 is about 44720.2924744461. The cubic root of 1999904559 is about 1259.9010082219.

The spelling of 1999904559 in words is "one billion, nine hundred ninety-nine million, nine hundred four thousand, five hundred fifty-nine".