997693 has 2 divisors, whose sum is σ = 997694. Its totient is φ = 997692.

The previous prime is 997681. The next prime is 997699. The reversal of 997693 is 396799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 956484 + 41209 = 978^2 + 203^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997693 is a prime.

It is an Ulam number.

997693 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997699) 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, 498846 + 498847.

It is an arithmetic number, because the mean of its divisors is an integer number (498847).

2⁹⁹⁷⁶⁹³ is an apocalyptic number.

It is an amenable number.

997693 is a deficient number, since it is larger than the sum of its proper divisors (1).

997693 is an equidigital number, since it uses as much as digits as its factorization.

997693 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91854, while the sum is 43.

The square root of 997693 is about 998.8458339504. The cubic root of 997693 is about 99.9230407880.

The spelling of 997693 in words is "nine hundred ninety-seven thousand, six hundred ninety-three".