989649 has 6 divisors (see below), whose sum is σ = 1429506. Its totient is φ = 659760.

The previous prime is 989647. The next prime is 989663. The reversal of 989649 is 946989.

It can be written as a sum of positive squares in only one way, i.e., 986049 + 3600 = 993^2 + 60^2 .

It is not a de Polignac number, because 989649 - 2¹ = 989647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (989641) 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 5 ways as a sum of consecutive naturals, for example, 54972 + ... + 54989.

It is an arithmetic number, because the mean of its divisors is an integer number (238251).

2⁹⁸⁹⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

989649 is a deficient number, since it is larger than the sum of its proper divisors (439857).

989649 is a wasteful number, since it uses less digits than its factorization.

989649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109967 (or 109964 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 989649 is about 994.8110373332. The cubic root of 989649 is about 99.6537692931.

The spelling of 989649 in words is "nine hundred eighty-nine thousand, six hundred forty-nine".