Base | Representation |
---|---|
bin | 100011110111… |
… | …1010010010011 |
3 | 1022101102212002 |
4 | 1013233102103 |
5 | 14303242112 |
6 | 1511024215 |
7 | 315563501 |
oct | 107572223 |
9 | 38342762 |
10 | 18805907 |
11 | a68517a |
12 | 636b06b |
13 | 3b85a73 |
14 | 26d7671 |
15 | 19b71c2 |
hex | 11ef493 |
18805907 has 2 divisors, whose sum is σ = 18805908. Its totient is φ = 18805906.
The previous prime is 18805903. The next prime is 18805939. The reversal of 18805907 is 70950881.
It is a weak prime.
It is an emirp because it is prime and its reverse (70950881) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 18805907 - 22 = 18805903 is a prime.
It is a Chen prime.
It is not a weakly prime, because it can be changed into another prime (18805903) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9402953 + 9402954.
It is an arithmetic number, because the mean of its divisors is an integer number (9402954).
Almost surely, 218805907 is an apocalyptic number.
18805907 is a deficient number, since it is larger than the sum of its proper divisors (1).
18805907 is an equidigital number, since it uses as much as digits as its factorization.
18805907 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 20160, while the sum is 38.
The square root of 18805907 is about 4336.5777982183. The cubic root of 18805907 is about 265.9284249733.
The spelling of 18805907 in words is "eighteen million, eight hundred five thousand, nine hundred seven".
• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.068 sec. • engine limits •