989901 has 30 divisors (see below), whose sum is σ = 1641486. Its totient is φ = 594000.

The previous prime is 989887. The next prime is 989909. The reversal of 989901 is 109989.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 9801 = 990^2 + 99^2 .

It is not a de Polignac number, because 989901 - 2⁵ = 989869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989909) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 9751 + ... + 9851.

2⁹⁸⁹⁹⁰¹ is an apocalyptic number.

It is an amenable number.

989901 is a deficient number, since it is larger than the sum of its proper divisors (651585).

989901 is a wasteful number, since it uses less digits than its factorization.

989901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 989901 is about 994.9376864910. The cubic root of 989901 is about 99.6622270455.

Multiplying 989901 by its reverse (109989), we get a square (108878221089 = 329967²).

It can be divided in two parts, 98 and 9901, that added together give a palindrome (9999).

The spelling of 989901 in words is "nine hundred eighty-nine thousand, nine hundred one".