1999802806 has 16 divisors (see below), whose sum is σ = 3078306000. Its totient is φ = 973834848.

The previous prime is 1999802771. The next prime is 1999802813. The reversal of 1999802806 is 6082089991.

It is a super-2 number, since 2×1999802806² = 7998422525770947272, which contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 3301 + ... + 63328.

It is an arithmetic number, because the mean of its divisors is an integer number (192394125).

Almost surely, 2^1999802806 is an apocalyptic number.

1999802806 is a deficient number, since it is larger than the sum of its proper divisors (1078503194).

1999802806 is a wasteful number, since it uses less digits than its factorization.

1999802806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67023.

The product of its (nonzero) digits is 559872, while the sum is 52.

The square root of 1999802806 is about 44719.1547997052. The cubic root of 1999802806 is about 1259.8796403886.

The spelling of 1999802806 in words is "one billion, nine hundred ninety-nine million, eight hundred two thousand, eight hundred six".