9745639 has 2 divisors, whose sum is σ = 9745640. Its totient is φ = 9745638.

The previous prime is 9745621. The next prime is 9745661. The reversal of 9745639 is 9365479.

It is a weak prime.

It is an emirp because it is prime and its reverse (9365479) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 9745639 - 2⁷ = 9745511 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9745595 and 9745604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9745669) 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 as a sum of consecutive naturals, namely, 4872819 + 4872820.

It is an arithmetic number, because the mean of its divisors is an integer number (4872820).

Almost surely, 2^9745639 is an apocalyptic number.

9745639 is a deficient number, since it is larger than the sum of its proper divisors (1).

9745639 is an equidigital number, since it uses as much as digits as its factorization.

9745639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 204120, while the sum is 43.

The square root of 9745639 is about 3121.8006022166. The cubic root of 9745639 is about 213.6010779425.

The spelling of 9745639 in words is "nine million, seven hundred forty-five thousand, six hundred thirty-nine".