9999667 has 2 divisors, whose sum is σ = 9999668. Its totient is φ = 9999666.

The previous prime is 9999659. The next prime is 9999677. The reversal of 9999667 is 7669999.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9999667 - 2³ = 9999659 is a prime.

It is a super-2 number, since 2×9999667² = 199986680221778, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9999637) 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 as a sum of consecutive naturals, namely, 4999833 + 4999834.

It is an arithmetic number, because the mean of its divisors is an integer number (4999834).

Almost surely, 2^9999667 is an apocalyptic number.

9999667 is a deficient number, since it is larger than the sum of its proper divisors (1).

9999667 is an equidigital number, since it uses as much as digits as its factorization.

9999667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 55.

The square root of 9999667 is about 3162.2250078070. The cubic root of 9999667 is about 215.4410775541.

The spelling of 9999667 in words is "nine million, nine hundred ninety-nine thousand, six hundred sixty-seven".