889999999 has 16 divisors (see below), whose sum is σ = 1028941056.
Its totient is φ = 754041600.
The previous prime is 889999991. The next prime is 890000003. The reversal of 889999999 is 999999988.
It can be divided in two parts, 8899999 and 99, that added together give a palindrome (8900098).
It is a cyclic number.
It is not a de Polignac number, because 889999999 - 23 = 889999991 is a prime.
It is a Duffinian number.
889999999 is a modest number, since divided by 99999 gives 8899 as remainder.
It is a plaindrome in base 10.
It is a zygodrome in base 10.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (889999991) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 426639 + ... + 428719.
It is an arithmetic number, because the mean of its divisors is an integer number (64308816).
Almost surely, 2889999999 is an apocalyptic number.
889999999 is a deficient number, since it is larger than the sum of its proper divisors (138941057).
889999999 is a wasteful number, since it uses less digits than its factorization.
889999999 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 2766.
The product of its digits is 306110016, while the sum is 79.
The square root of 889999999 is about 29832.8677635926.
The cubic root of 889999999 is about 961.9001712474.
The spelling of 889999999 in words is "eight hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".