999999969 has 8 divisors (see below), whose sum is σ = 1334553120. Its totient is φ = 666056736.

The previous prime is 999999937. The next prime is 1000000007. The reversal of 999999969 is 969999999.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 999999969 - 2⁵ = 999999937 is a prime.

It is a super-2 number, since 2×999999969² = 1999999876000001922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 999999894 and 999999903.

It is not an unprimeable number, because it can be changed into a prime (999999929) by changing a digit.

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, 148639 + ... + 155220.

It is an arithmetic number, because the mean of its divisors is an integer number (166819140).

Almost surely, 2^999999969 is an apocalyptic number.

It is an amenable number.

999999969 is a deficient number, since it is larger than the sum of its proper divisors (334553151).

999999969 is a wasteful number, since it uses less digits than its factorization.

999999969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304959.

The product of its digits is 258280326, while the sum is 78.

The square root of 999999969 is about 31622.7761115308. The cubic root of 999999969 is about 999.9999896667. Note that the first 4 decimals are identical.

The spelling of 999999969 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred sixty-nine".