999969807 has 32 divisors (see below), whose sum is σ = 1394265600. Its totient is φ = 636923520.

The previous prime is 999969797. The next prime is 999969823. The reversal of 999969807 is 708969999.

It is not a de Polignac number, because 999969807 - 2⁶ = 999969743 is a prime.

It is a super-2 number, since 2×999969807² = 1999879229823234498, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999969847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2865069 + ... + 2865417.

It is an arithmetic number, because the mean of its divisors is an integer number (43570800).

Almost surely, 2^999969807 is an apocalyptic number.

999969807 is a deficient number, since it is larger than the sum of its proper divisors (394295793).

999969807 is a wasteful number, since it uses less digits than its factorization.

999969807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 783.

The product of its (nonzero) digits is 19840464, while the sum is 66.

The square root of 999969807 is about 31622.2992048333. The cubic root of 999969807 is about 999.9899355654.

The spelling of 999969807 in words is "nine hundred ninety-nine million, nine hundred sixty-nine thousand, eight hundred seven".