997938 has 12 divisors (see below), whose sum is σ = 2162238. Its totient is φ = 332640.

The previous prime is 997933. The next prime is 997949. The reversal of 997938 is 839799.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 870489 + 127449 = 933^2 + 357^2 .

It is a junction number, because it is equal to n+sod(n) for n = 997893 and 997902.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997938.

It is not an unprimeable number, because it can be changed into a prime (997933) by changing a digit.

997938 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 27703 + ... + 27738.

2⁹⁹⁷⁹³⁸ is an apocalyptic number.

997938 is an abundant number, since it is smaller than the sum of its proper divisors (1164300).

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

997938 is a wasteful number, since it uses less digits than its factorization.

997938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55449 (or 55446 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 997938 is about 998.9684679708. The cubic root of 997938 is about 99.9312193698.

The spelling of 997938 in words is "nine hundred ninety-seven thousand, nine hundred thirty-eight".