1799305985 has 16 divisors (see below), whose sum is σ = 2371628160. Its totient is φ = 1304392320.

The previous prime is 1799305961. The next prime is 1799306009. The reversal of 1799305985 is 5895039971.

It is an interprime number because it is at equal distance from previous prime (1799305961) and next prime (1799306009).

It is a de Polignac number, because none of the positive numbers 2^k-1799305985 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1799305985.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409556 + ... + 413925.

It is an arithmetic number, because the mean of its divisors is an integer number (148226760).

Almost surely, 2^1799305985 is an apocalyptic number.

It is an amenable number.

1799305985 is a deficient number, since it is larger than the sum of its proper divisors (572322175).

1799305985 is a wasteful number, since it uses less digits than its factorization.

1799305985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823528.

The product of its (nonzero) digits is 3061800, while the sum is 56.

The square root of 1799305985 is about 42418.2270374423. The cubic root of 1799305985 is about 1216.2840405206.

The spelling of 1799305985 in words is "one billion, seven hundred ninety-nine million, three hundred five thousand, nine hundred eighty-five".