9664739 has 4 divisors (see below), whose sum is σ = 11045424. Its totient is φ = 8284056.

The previous prime is 9664729. The next prime is 9664741. The reversal of 9664739 is 9374669.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9664739 - 2¹² = 9660643 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9664739.

It is not an unprimeable number, because it can be changed into a prime (9664729) 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, 690332 + ... + 690345.

It is an arithmetic number, because the mean of its divisors is an integer number (2761356).

Almost surely, 2^9664739 is an apocalyptic number.

9664739 is a deficient number, since it is larger than the sum of its proper divisors (1380685).

9664739 is a wasteful number, since it uses less digits than its factorization.

9664739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380684.

The product of its digits is 244944, while the sum is 44.

The square root of 9664739 is about 3108.8163342340. The cubic root of 9664739 is about 213.0083901270.

The spelling of 9664739 in words is "nine million, six hundred sixty-four thousand, seven hundred thirty-nine".