989839 has 2 divisors, whose sum is σ = 989840. Its totient is φ = 989838.

The previous prime is 989837. The next prime is 989869. The reversal of 989839 is 938989.

It is a weak prime.

It is an emirp because it is prime and its reverse (938989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989839 - 2¹ = 989837 is a prime.

Together with 989837, it forms a pair of twin primes.

It is a Chen prime.

989839 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494919 + 494920.

It is an arithmetic number, because the mean of its divisors is an integer number (494920).

2⁹⁸⁹⁸³⁹ is an apocalyptic number.

989839 is a deficient number, since it is larger than the sum of its proper divisors (1).

989839 is an equidigital number, since it uses as much as digits as its factorization.

989839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 46.

The square root of 989839 is about 994.9065282729. The cubic root of 989839 is about 99.6601463031.

The spelling of 989839 in words is "nine hundred eighty-nine thousand, eight hundred thirty-nine".