Base | Representation |
---|---|
bin | 11010101000100101100011 |
3 | 111010201111010 |
4 | 122220211203 |
5 | 3241410422 |
6 | 405352003 |
7 | 113226435 |
oct | 32504543 |
9 | 14121433 |
10 | 6981987 |
11 | 3a39741 |
12 | 2408603 |
13 | 15a5c6c |
14 | cda655 |
15 | 92db0c |
hex | 6a8963 |
6981987 has 16 divisors (see below), whose sum is σ = 9855360. Its totient is φ = 4384512.
The previous prime is 6981983. The next prime is 6982009. The reversal of 6981987 is 7891896.
It is a happy number.
It is not a de Polignac number, because 6981987 - 22 = 6981983 is a prime.
It is not an unprimeable number, because it can be changed into a prime (6981983) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19603 + ... + 19955.
It is an arithmetic number, because the mean of its divisors is an integer number (615960).
Almost surely, 26981987 is an apocalyptic number.
6981987 is a deficient number, since it is larger than the sum of its proper divisors (2873373).
6981987 is a wasteful number, since it uses less digits than its factorization.
6981987 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 722.
The product of its digits is 217728, while the sum is 48.
The square root of 6981987 is about 2642.3449812619. The cubic root of 6981987 is about 191.1288933812.
Subtracting 6981987 from its reverse (7891896), we obtain a palindrome (909909).
The spelling of 6981987 in words is "six million, nine hundred eighty-one thousand, nine hundred eighty-seven".
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