997783 has 2 divisors, whose sum is σ = 997784. Its totient is φ = 997782.

The previous prime is 997769. The next prime is 997793. The reversal of 997783 is 387799.

It is a strong prime.

It is an emirp because it is prime and its reverse (387799) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 997783 - 2⁵ = 997751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498891 + 498892.

It is an arithmetic number, because the mean of its divisors is an integer number (498892).

2⁹⁹⁷⁷⁸³ is an apocalyptic number.

997783 is a deficient number, since it is larger than the sum of its proper divisors (1).

997783 is an equidigital number, since it uses as much as digits as its factorization.

997783 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 997783 is about 998.8908849319. The cubic root of 997783 is about 99.9260453205.

The spelling of 997783 in words is "nine hundred ninety-seven thousand, seven hundred eighty-three".