9964639 has 2 divisors, whose sum is σ = 9964640. Its totient is φ = 9964638.

The previous prime is 9964631. The next prime is 9964651. The reversal of 9964639 is 9364699.

It is a weak prime.

It is an emirp because it is prime and its reverse (9364699) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9964639 - 2³ = 9964631 is a prime.

9964639 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9964631) 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, 4982319 + 4982320.

It is an arithmetic number, because the mean of its divisors is an integer number (4982320).

Almost surely, 2^9964639 is an apocalyptic number.

9964639 is a deficient number, since it is larger than the sum of its proper divisors (1).

9964639 is an equidigital number, since it uses as much as digits as its factorization.

9964639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 46.

The square root of 9964639 is about 3156.6816437519. The cubic root of 9964639 is about 215.1892258740.

The spelling of 9964639 in words is "nine million, nine hundred sixty-four thousand, six hundred thirty-nine".