989638 has 16 divisors (see below), whose sum is σ = 1693440. Its totient is φ = 429696.

The previous prime is 989629. The next prime is 989641. The reversal of 989638 is 836989.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 989594 and 989603.

It is a congruent number.

It is an unprimeable number.

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, 678 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (105840).

2⁹⁸⁹⁶³⁸ is an apocalyptic number.

989638 is a deficient number, since it is larger than the sum of its proper divisors (703802).

989638 is a wasteful number, since it uses less digits than its factorization.

989638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2271.

The product of its digits is 93312, while the sum is 43.

The square root of 989638 is about 994.8055086297. The cubic root of 989638 is about 99.6534000728.

The spelling of 989638 in words is "nine hundred eighty-nine thousand, six hundred thirty-eight".