Base | Representation |
---|---|
bin | 101111010000… |
… | …101001110101 |
3 | 212022102111011 |
4 | 233100221311 |
5 | 11132421411 |
6 | 1121312221 |
7 | 210206323 |
oct | 57205165 |
9 | 25272434 |
10 | 12388981 |
11 | 6aa2030 |
12 | 4195671 |
13 | 274a077 |
14 | 1906d13 |
15 | 114ac21 |
hex | bd0a75 |
12388981 has 8 divisors (see below), whose sum is σ = 13636224. Its totient is φ = 11161920.
The previous prime is 12388967. The next prime is 12388991. The reversal of 12388981 is 18988321.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 12388981 - 25 = 12388949 is a prime.
It is a super-2 number, since 2×123889812 = 306973700436722, which contains 22 as substring.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (12388921) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3741 + ... + 6226.
It is an arithmetic number, because the mean of its divisors is an integer number (1704528).
Almost surely, 212388981 is an apocalyptic number.
12388981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.
It is an amenable number.
12388981 is a deficient number, since it is larger than the sum of its proper divisors (1247243).
12388981 is a wasteful number, since it uses less digits than its factorization.
12388981 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 10091.
The product of its digits is 27648, while the sum is 40.
The square root of 12388981 is about 3519.7984317287. The cubic root of 12388981 is about 231.3903247666.
The spelling of 12388981 in words is "twelve million, three hundred eighty-eight thousand, nine hundred eighty-one".
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