997766 has 48 divisors (see below), whose sum is σ = 2042880. Its totient is φ = 356400.

The previous prime is 997751. The next prime is 997769. The reversal of 997766 is 667799.

Its product of digits (142884) is a multiple of the sum of its prime factors (81).

It is a Curzon number.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (997769) by changing a digit.

997766 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 23 ways as a sum of consecutive naturals, for example, 32171 + ... + 32201.

It is an arithmetic number, because the mean of its divisors is an integer number (42560).

2⁹⁹⁷⁷⁶⁶ is an apocalyptic number.

997766 is an abundant number, since it is smaller than the sum of its proper divisors (1045114).

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

997766 is a wasteful number, since it uses less digits than its factorization.

997766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 70 counting only the distinct ones).

The product of its digits is 142884, while the sum is 44.

The square root of 997766 is about 998.8823754577. The cubic root of 997766 is about 99.9254778116.

The spelling of 997766 in words is "nine hundred ninety-seven thousand, seven hundred sixty-six".