989500 has 24 divisors (see below), whose sum is σ = 2162160. Its totient is φ = 395600.

The previous prime is 989479. The next prime is 989507. The reversal of 989500 is 5989.

It is a super-2 number, since 2×989500² = 1958220500000, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989507) by changing a digit.

989500 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 490 + ... + 1489.

It is an arithmetic number, because the mean of its divisors is an integer number (90090).

2⁹⁸⁹⁵⁰⁰ is an apocalyptic number.

It is an amenable number.

989500 is an abundant number, since it is smaller than the sum of its proper divisors (1172660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989500 is a wasteful number, since it uses less digits than its factorization.

989500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 31.

The square root of 989500 is about 994.7361459201. The cubic root of 989500 is about 99.6487678038.

The spelling of 989500 in words is "nine hundred eighty-nine thousand, five hundred".