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989959989 = 3329986663
BaseRepresentation
bin111011000000011…
…001011100110101
32112222210011210210
4323000121130311
54011412204424
6242122140033
733350343504
oct7300313465
92488704723
10989959989
11468896657
12237651619
1312a133355
149569683b
155bd9b729
hex3b019735

989959989 has 4 divisors (see below), whose sum is σ = 1319946656. Its totient is φ = 659973324.

The previous prime is 989959973. The next prime is 989959991.

989959989 is nontrivially palindromic in base 10.

989959989 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 989959989 - 24 = 989959973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 989959989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989959969) 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, 164993329 + ... + 164993334.

It is an arithmetic number, because the mean of its divisors is an integer number (329986664).

Almost surely, 2989959989 is an apocalyptic number.

It is an amenable number.

989959989 is a deficient number, since it is larger than the sum of its proper divisors (329986667).

989959989 is a wasteful number, since it uses less digits than its factorization.

989959989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329986666.

The product of its digits is 170061120, while the sum is 75.

The square root of 989959989 is about 31463.6296221526. The cubic root of 989959989 is about 996.6420665708.

The spelling of 989959989 in words is "nine hundred eighty-nine million, nine hundred fifty-nine thousand, nine hundred eighty-nine".

Divisors: 1 3 329986663 989959989