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18127305 = 325728221
BaseRepresentation
bin100010100100…
…1100111001001
31021002221222200
41011021213021
514120033210
61444310413
7310036200
oct105114711
937087880
1018127305
11a261349
1260a2409
1339a8c21
14259c237
1518d10c0
hex11499c9

18127305 has 36 divisors (see below), whose sum is σ = 36555012. Its totient is φ = 8285760.

The previous prime is 18127301. The next prime is 18127313. The reversal of 18127305 is 50372181.

Adding to 18127305 its reverse (50372181), we get a palindrome (68499486).

It can be written as a sum of positive squares in 2 ways, for example, as 12595401 + 5531904 = 3549^2 + 2352^2 .

It is not a de Polignac number, because 18127305 - 22 = 18127301 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18127301) 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 35 ways as a sum of consecutive naturals, for example, 1906 + ... + 6315.

It is an arithmetic number, because the mean of its divisors is an integer number (1015417).

Almost surely, 218127305 is an apocalyptic number.

18127305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18127305 is an abundant number, since it is smaller than the sum of its proper divisors (18427707).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18127305 is a wasteful number, since it uses less digits than its factorization.

18127305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8246 (or 8236 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 18127305 is about 4257.6172913967. The cubic root of 18127305 is about 262.6905283435.

The spelling of 18127305 in words is "eighteen million, one hundred twenty-seven thousand, three hundred five".