9997839 has 12 divisors (see below), whose sum is σ = 14678872. Its totient is φ = 6555600.

The previous prime is 9997831. The next prime is 9997859. The reversal of 9997839 is 9387999.

It is a happy number.

It is not a de Polignac number, because 9997839 - 2³ = 9997831 is a prime.

It is an Ulam number.

It is a Duffinian number.

9997839 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997831) 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 11 ways as a sum of consecutive naturals, for example, 8557 + ... + 9654.

Almost surely, 2^9997839 is an apocalyptic number.

9997839 is a deficient number, since it is larger than the sum of its proper divisors (4681033).

9997839 is a wasteful number, since it uses less digits than its factorization.

9997839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18278 (or 18275 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 9997839 is about 3161.9359576057. The cubic root of 9997839 is about 215.4279487739.

The spelling of 9997839 in words is "nine million, nine hundred ninety-seven thousand, eight hundred thirty-nine".