997784 has 16 divisors (see below), whose sum is σ = 1883520. Its totient is φ = 495520.

The previous prime is 997783. The next prime is 997793. The reversal of 997784 is 487799.

It is a d-powerful number, because it can be written as 9² + 9⁵ + 7⁵ + 7⁷ + 8⁵ + 4⁸ .

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 997784.

It is not an unprimeable number, because it can be changed into a prime (997783) 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 3 ways as a sum of consecutive naturals, for example, 1202 + ... + 1854.

It is an arithmetic number, because the mean of its divisors is an integer number (117720).

2⁹⁹⁷⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

997784 is a deficient number, since it is larger than the sum of its proper divisors (885736).

997784 is a wasteful number, since it uses less digits than its factorization.

997784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 850 (or 846 counting only the distinct ones).

The product of its digits is 127008, while the sum is 44.

The square root of 997784 is about 998.8913854869. The cubic root of 997784 is about 99.9260787032.

The spelling of 997784 in words is "nine hundred ninety-seven thousand, seven hundred eighty-four".