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989979989 = 172914913477
BaseRepresentation
bin111011000000011…
…110010101010101
32112222211012020112
4323000132111111
54011413324424
6242122412405
733350456015
oct7300362525
92488735215
10989979989
114688aa689
12237661105
1312a13c49b
149569dc45
155bda260e
hex3b01e555

989979989 has 16 divisors (see below), whose sum is σ = 1091718000. Its totient is φ = 893512704.

The previous prime is 989979983. The next prime is 989980003.

989979989 is nontrivially palindromic in base 10.

989979989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 1380625 + 988599364 = 1175^2 + 31442^2 .

It is a cyclic number.

It is not a de Polignac number, because 989979989 - 228 = 721544533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989979983) 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, 66719 + ... + 80195.

It is an arithmetic number, because the mean of its divisors is an integer number (68232375).

Almost surely, 2989979989 is an apocalyptic number.

It is an amenable number.

989979989 is a deficient number, since it is larger than the sum of its proper divisors (101738011).

989979989 is a wasteful number, since it uses less digits than its factorization.

989979989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13672.

The product of its digits is 238085568, while the sum is 77.

The square root of 989979989 is about 31463.9474478331. The cubic root of 989979989 is about 996.6487781912.

The spelling of 989979989 in words is "nine hundred eighty-nine million, nine hundred seventy-nine thousand, nine hundred eighty-nine".

Divisors: 1 17 29 149 493 2533 4321 13477 73457 229109 390833 2008073 6644161 34137241 58234117 989979989