989783 has 2 divisors, whose sum is σ = 989784. Its totient is φ = 989782.

The previous prime is 989777. The next prime is 989797. The reversal of 989783 is 387989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989783 - 2⁶ = 989719 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 (989743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494891 + 494892.

It is an arithmetic number, because the mean of its divisors is an integer number (494892).

2⁹⁸⁹⁷⁸³ is an apocalyptic number.

989783 is a deficient number, since it is larger than the sum of its proper divisors (1).

989783 is an equidigital number, since it uses as much as digits as its factorization.

989783 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 44.

The square root of 989783 is about 994.8783845275. The cubic root of 989783 is about 99.6582668481.

The spelling of 989783 in words is "nine hundred eighty-nine thousand, seven hundred eighty-three".