993689 has 2 divisors, whose sum is σ = 993690. Its totient is φ = 993688.

The previous prime is 993683. The next prime is 993703. The reversal of 993689 is 986399.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 795664 + 198025 = 892^2 + 445^2 .

It is a cyclic number.

It is not a de Polignac number, because 993689 - 2¹⁶ = 928153 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993683) 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 as a sum of consecutive naturals, namely, 496844 + 496845.

It is an arithmetic number, because the mean of its divisors is an integer number (496845).

2⁹⁹³⁶⁸⁹ is an apocalyptic number.

It is an amenable number.

993689 is a deficient number, since it is larger than the sum of its proper divisors (1).

993689 is an equidigital number, since it uses as much as digits as its factorization.

993689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 44.

The square root of 993689 is about 996.8395056377. The cubic root of 993689 is about 99.7891892338.

The spelling of 993689 in words is "nine hundred ninety-three thousand, six hundred eighty-nine".