9999669 has 16 divisors (see below), whose sum is σ = 13820544.
Its totient is φ = 6427200.
The previous prime is 9999667. The next prime is 9999677. The reversal of 9999669 is 9669999.
It is not a de Polignac number, because 9999669 - 21 = 9999667 is a prime.
It is a super-2 number, since 2×99996692 = 199986760219122, which contains 22 as substring.
It is a Curzon number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9999667) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9184 + ... + 10214.
It is an arithmetic number, because the mean of its divisors is an integer number (863784).
Almost surely, 29999669 is an apocalyptic number.
It is an amenable number.
9999669 is a deficient number, since it is larger than the sum of its proper divisors (3820875).
9999669 is a wasteful number, since it uses less digits than its factorization.
9999669 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1148.
The product of its digits is 2125764, while the sum is 57.
The square root of 9999669 is about 3162.2253240400.
The cubic root of 9999669 is about 215.4410919174.
The spelling of 9999669 in words is "nine million, nine hundred ninety-nine thousand, six hundred sixty-nine".