997996 has 6 divisors (see below), whose sum is σ = 1746500. Its totient is φ = 498996.

The previous prime is 997991. The next prime is 998009. The reversal of 997996 is 699799.

It is a happy number.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (997991) by changing a digit.

997996 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124746 + ... + 124753.

2⁹⁹⁷⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

997996 is a deficient number, since it is larger than the sum of its proper divisors (748504).

997996 is a wasteful number, since it uses less digits than its factorization.

997996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249503 (or 249501 counting only the distinct ones).

The product of its digits is 275562, while the sum is 49.

The square root of 997996 is about 998.9974974944. The cubic root of 997996 is about 99.9331553279.

The spelling of 997996 in words is "nine hundred ninety-seven thousand, nine hundred ninety-six".