9999967 has 4 divisors (see below), whose sum is σ = 10015416.
Its totient is φ = 9984520.
The previous prime is 9999943. The next prime is 9999971. The reversal of 9999967 is 7699999.
It is a happy number.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7699999 = 53 ⋅145283.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-9999967 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (9999907) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6709 + ... + 8062.
It is an arithmetic number, because the mean of its divisors is an integer number (2503854).
Almost surely, 29999967 is an apocalyptic number.
9999967 is a deficient number, since it is larger than the sum of its proper divisors (15449).
9999967 is a wasteful number, since it uses less digits than its factorization.
9999967 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 15448.
The product of its digits is 2480058, while the sum is 58.
The square root of 9999967 is about 3162.2724424059.
The cubic root of 9999967 is about 215.4432320151.
Subtracting from 9999967 its reverse (7699999), we obtain a cube (2299968 = 1323).
The spelling of 9999967 in words is "nine million, nine hundred ninety-nine thousand, nine hundred sixty-seven".