889989 has 4 divisors (see below), whose sum is σ = 1186656. Its totient is φ = 593324.

The previous prime is 889963. The next prime is 889997. The reversal of 889989 is 989988.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 889989 - 2⁵ = 889957 is a prime.

It is an Ulam number.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (889909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148329 + ... + 148334.

It is an arithmetic number, because the mean of its divisors is an integer number (296664).

2⁸⁸⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

889989 is a deficient number, since it is larger than the sum of its proper divisors (296667).

889989 is a wasteful number, since it uses less digits than its factorization.

889989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296666.

The product of its digits is 373248, while the sum is 51.

The square root of 889989 is about 943.3922831993. The cubic root of 889989 is about 96.1896208707.

Subtracting 889989 from its reverse (989988), we obtain a palindrome (99999).

The spelling of 889989 in words is "eight hundred eighty-nine thousand, nine hundred eighty-nine".