999969806 has 32 divisors (see below), whose sum is σ = 1654898688. Its totient is φ = 449396640.

The previous prime is 999969797. The next prime is 999969823. The reversal of 999969806 is 608969999.

999969806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×999969806² = 1999879225823355272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1293236 + ... + 1294008.

It is an arithmetic number, because the mean of its divisors is an integer number (51715584).

Almost surely, 2^999969806 is an apocalyptic number.

999969806 is a deficient number, since it is larger than the sum of its proper divisors (654928882).

999969806 is a wasteful number, since it uses less digits than its factorization.

999969806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 17006112, while the sum is 65.

The square root of 999969806 is about 31622.2991890217. The cubic root of 999969806 is about 999.9899352320.

The spelling of 999969806 in words is "nine hundred ninety-nine million, nine hundred sixty-nine thousand, eight hundred six".