9668639 has 2 divisors, whose sum is σ = 9668640. Its totient is φ = 9668638.

The previous prime is 9668599. The next prime is 9668647. The reversal of 9668639 is 9368669.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9668639 - 2¹⁶ = 9603103 is a prime.

It is a super-2 number, since 2×9668639² = 186965160224642, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 9668593 and 9668602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9668689) 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, 4834319 + 4834320.

It is an arithmetic number, because the mean of its divisors is an integer number (4834320).

Almost surely, 2^9668639 is an apocalyptic number.

9668639 is a deficient number, since it is larger than the sum of its proper divisors (1).

9668639 is an equidigital number, since it uses as much as digits as its factorization.

9668639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 419904, while the sum is 47.

The square root of 9668639 is about 3109.4435193455. The cubic root of 9668639 is about 213.0370379434.

The spelling of 9668639 in words is "nine million, six hundred sixty-eight thousand, six hundred thirty-nine".