989663 has 2 divisors, whose sum is σ = 989664.
Its totient is φ = 989662.
The previous prime is 989647. The next prime is 989671. The reversal of 989663 is 366989.
It is a strong prime.
It is a cyclic number.
It is not a de Polignac number, because 989663 - 24 = 989647 is a prime.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 989663.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (989623) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494831 + 494832.
It is an arithmetic number, because the mean of its divisors is an integer number (494832).
2989663 is an apocalyptic number.
989663 is a deficient number, since it is larger than the sum of its proper divisors (1).
989663 is an equidigital number, since it uses as much as digits as its factorization.
989663 is an evil number, because the sum of its binary digits is even.
The product of its digits is 69984, while the sum is 41.
The square root of 989663 is about 994.8180738205.
The cubic root of 989663 is about 99.6542392059.
The spelling of 989663 in words is "nine hundred eighty-nine thousand, six hundred sixty-three".