9725839 has 2 divisors, whose sum is σ = 9725840. Its totient is φ = 9725838.

The previous prime is 9725827. The next prime is 9725873. The reversal of 9725839 is 9385279.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9725839 - 2⁹ = 9725327 is a prime.

It is a d-powerful number, because it can be written as 9⁵ + 7⁶ + 2²² + 5⁸ + 8⁴ + 3¹¹ + 9⁷ .

It is a junction number, because it is equal to n+sod(n) for n = 9725795 and 9725804.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9725809) 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, 4862919 + 4862920.

It is an arithmetic number, because the mean of its divisors is an integer number (4862920).

Almost surely, 2^9725839 is an apocalyptic number.

9725839 is a deficient number, since it is larger than the sum of its proper divisors (1).

9725839 is an equidigital number, since it uses as much as digits as its factorization.

9725839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The square root of 9725839 is about 3118.6277430947. The cubic root of 9725839 is about 213.4563236658.

The spelling of 9725839 in words is "nine million, seven hundred twenty-five thousand, eight hundred thirty-nine".