9997943 has 4 divisors (see below), whose sum is σ = 10007040. Its totient is φ = 9988848.

The previous prime is 9997937. The next prime is 9997951. The reversal of 9997943 is 3497999.

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.

It is a cyclic number.

It is not a de Polignac number, because 9997943 - 2⁴ = 9997927 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 9997891 and 9997900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997913) 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, 2630 + ... + 5187.

It is an arithmetic number, because the mean of its divisors is an integer number (2501760).

Almost surely, 2^9997943 is an apocalyptic number.

9997943 is a deficient number, since it is larger than the sum of its proper divisors (9097).

9997943 is a wasteful number, since it uses less digits than its factorization.

9997943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9096.

The product of its digits is 551124, while the sum is 50.

The square root of 9997943 is about 3161.9524031838. The cubic root of 9997943 is about 215.4286957497.

The spelling of 9997943 in words is "nine million, nine hundred ninety-seven thousand, nine hundred forty-three".