997808 has 40 divisors (see below), whose sum is σ = 2261760. Its totient is φ = 417600.

The previous prime is 997807. The next prime is 997811. The reversal of 997808 is 808799.

It is not an unprimeable number, because it can be changed into a prime (997807) 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 7 ways as a sum of consecutive naturals, for example, 6533 + ... + 6683.

It is an arithmetic number, because the mean of its divisors is an integer number (56544).

2⁹⁹⁷⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 997808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1130880).

997808 is an abundant number, since it is smaller than the sum of its proper divisors (1263952).

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

997808 is a wasteful number, since it uses less digits than its factorization.

997808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 997808 is about 998.9033987328. The cubic root of 997808 is about 99.9268798808.

The spelling of 997808 in words is "nine hundred ninety-seven thousand, eight hundred eight".