999969805 has 4 divisors (see below), whose sum is σ = 1199963772. Its totient is φ = 799975840.

The previous prime is 999969797. The next prime is 999969823. The reversal of 999969805 is 508969999.

999969805 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 481451364 + 518518441 = 21942^2 + 22771^2 .

It is not a de Polignac number, because 999969805 - 2³ = 999969797 is a prime.

It is a super-2 number, since 2×999969805² = 1999879221823476050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99996976 + ... + 99996985.

It is an arithmetic number, because the mean of its divisors is an integer number (299990943).

Almost surely, 2^999969805 is an apocalyptic number.

It is an amenable number.

999969805 is a deficient number, since it is larger than the sum of its proper divisors (199993967).

999969805 is a wasteful number, since it uses less digits than its factorization.

999969805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199993966.

The product of its (nonzero) digits is 14171760, while the sum is 64.

The square root of 999969805 is about 31622.2991732100. The cubic root of 999969805 is about 999.9899348987.

The spelling of 999969805 in words is "nine hundred ninety-nine million, nine hundred sixty-nine thousand, eight hundred five".