9997938 has 32 divisors (see below), whose sum is σ = 23526720. Its totient is φ = 3136320.

The previous prime is 9997937. The next prime is 9997951. The reversal of 9997938 is 8397999.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997937) 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 15 ways as a sum of consecutive naturals, for example, 4528 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (735210).

Almost surely, 2^9997938 is an apocalyptic number.

9997938 is an abundant number, since it is smaller than the sum of its proper divisors (13528782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9997938 is a wasteful number, since it uses less digits than its factorization.

9997938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10919 (or 10913 counting only the distinct ones).

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

The square root of 9997938 is about 3161.9516125330. The cubic root of 9997938 is about 215.4286598375.

The spelling of 9997938 in words is "nine million, nine hundred ninety-seven thousand, nine hundred thirty-eight".