989771 has 4 divisors (see below), whose sum is σ = 992544.
Its totient is φ = 987000.
The previous prime is 989761. The next prime is 989777. The reversal of 989771 is 177989.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 989771 - 214 = 973387 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (989777) 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 in 3 ways as a sum of consecutive naturals, for example, 755 + ... + 1596.
It is an arithmetic number, because the mean of its divisors is an integer number (248136).
2989771 is an apocalyptic number.
989771 is a deficient number, since it is larger than the sum of its proper divisors (2773).
989771 is a wasteful number, since it uses less digits than its factorization.
989771 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2772.
The product of its digits is 31752, while the sum is 41.
The square root of 989771 is about 994.8723536213.
The cubic root of 989771 is about 99.6578640986.
The spelling of 989771 in words is "nine hundred eighty-nine thousand, seven hundred seventy-one".