1997773 has 2 divisors, whose sum is σ = 1997774. Its totient is φ = 1997772.

The previous prime is 1997771. The next prime is 1997813. The reversal of 1997773 is 3777991.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1447209 + 550564 = 1203^2 + 742^2 .

It is a cyclic number.

It is not a de Polignac number, because 1997773 - 2¹ = 1997771 is a prime.

Together with 1997771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1997771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 998886 + 998887.

It is an arithmetic number, because the mean of its divisors is an integer number (998887).

2^1997773 is an apocalyptic number.

It is an amenable number.

1997773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1997773 is an equidigital number, since it uses as much as digits as its factorization.

1997773 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 83349, while the sum is 43.

The square root of 1997773 is about 1413.4259796678. The cubic root of 1997773 is about 125.9453235518.

The spelling of 1997773 in words is "one million, nine hundred ninety-seven thousand, seven hundred seventy-three".