989635 has 4 divisors (see below), whose sum is σ = 1187568. Its totient is φ = 791704.

The previous prime is 989629. The next prime is 989641. The reversal of 989635 is 536989.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (989629) and next prime (989641).

It is a cyclic number.

It is not a de Polignac number, because 989635 - 2⁷ = 989507 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a Duffinian number.

989635 is a lucky number.

It is a zygodrome in base 2.

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 3 ways as a sum of consecutive naturals, for example, 98959 + ... + 98968.

It is an arithmetic number, because the mean of its divisors is an integer number (296892).

2⁹⁸⁹⁶³⁵ is an apocalyptic number.

989635 is a deficient number, since it is larger than the sum of its proper divisors (197933).

989635 is a wasteful number, since it uses less digits than its factorization.

989635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197932.

The product of its digits is 58320, while the sum is 40.

The square root of 989635 is about 994.8040007961. The cubic root of 989635 is about 99.6532993759.

The spelling of 989635 in words is "nine hundred eighty-nine thousand, six hundred thirty-five".