989644 has 24 divisors (see below), whose sum is σ = 1870848. Its totient is φ = 456720.

The previous prime is 989641. The next prime is 989647. The reversal of 989644 is 446989.

It is an interprime number because it is at equal distance from previous prime (989641) and next prime (989647).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 989597 and 989606.

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 7 ways as a sum of consecutive naturals, for example, 2679 + ... + 3025.

It is an arithmetic number, because the mean of its divisors is an integer number (77952).

2⁹⁸⁹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

989644 is a deficient number, since it is larger than the sum of its proper divisors (881204).

989644 is a wasteful number, since it uses less digits than its factorization.

989644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 403 counting only the distinct ones).

The product of its digits is 62208, while the sum is 40.

The square root of 989644 is about 994.8085242900. The cubic root of 989644 is about 99.6536014661.

The spelling of 989644 in words is "nine hundred eighty-nine thousand, six hundred forty-four".