989578 has 4 divisors (see below), whose sum is σ = 1484370. Its totient is φ = 494788.

The previous prime is 989561. The next prime is 989579. The reversal of 989578 is 875989.

989578 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875989 = 509 ⋅1721.

It can be written as a sum of positive squares in only one way, i.e., 946729 + 42849 = 973^2 + 207^2 .

It is not an unprimeable number, because it can be changed into a prime (989579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247393 + ... + 247396.

2⁹⁸⁹⁵⁷⁸ is an apocalyptic number.

989578 is a deficient number, since it is larger than the sum of its proper divisors (494792).

989578 is a wasteful number, since it uses less digits than its factorization.

989578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494791.

The product of its digits is 181440, while the sum is 46.

The square root of 989578 is about 994.7753515242. The cubic root of 989578 is about 99.6513860957.

The spelling of 989578 in words is "nine hundred eighty-nine thousand, five hundred seventy-eight".