9897739 has 4 divisors (see below), whose sum is σ = 9907056. Its totient is φ = 9888424.

The previous prime is 9897703. The next prime is 9897743. The reversal of 9897739 is 9377989.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9377989 = 179 ⋅52391.

It is a cyclic number.

It is not a de Polignac number, because 9897739 - 2⁹ = 9897227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9897749) 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 in 3 ways as a sum of consecutive naturals, for example, 2824 + ... + 5269.

It is an arithmetic number, because the mean of its divisors is an integer number (2476764).

Almost surely, 2^9897739 is an apocalyptic number.

9897739 is a deficient number, since it is larger than the sum of its proper divisors (9317).

9897739 is a wasteful number, since it uses less digits than its factorization.

9897739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316.

The product of its digits is 857304, while the sum is 52.

The square root of 9897739 is about 3146.0672275080. The cubic root of 9897739 is about 214.7065692427.

The spelling of 9897739 in words is "nine million, eight hundred ninety-seven thousand, seven hundred thirty-nine".