989491 has 8 divisors (see below), whose sum is σ = 1039680. Its totient is φ = 940608.

The previous prime is 989479. The next prime is 989507. The reversal of 989491 is 194989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 989491 - 2⁹ = 988979 is a prime.

It is a Duffinian number.

989491 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (989411) 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 7 ways as a sum of consecutive naturals, for example, 1455 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (129960).

2⁹⁸⁹⁴⁹¹ is an apocalyptic number.

989491 is a deficient number, since it is larger than the sum of its proper divisors (50189).

989491 is a wasteful number, since it uses less digits than its factorization.

989491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653.

The product of its digits is 23328, while the sum is 40.

The square root of 989491 is about 994.7316220971. The cubic root of 989491 is about 99.6484656843.

The spelling of 989491 in words is "nine hundred eighty-nine thousand, four hundred ninety-one".