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12805205 = 57715153
BaseRepresentation
bin110000110110…
…010001010101
3220002120102212
4300312101111
511234231310
61134243205
7213561650
oct60662125
926076385
1012805205
117256816
124356505
13286465a
1419b4897
1511ce205
hexc36455

12805205 has 16 divisors (see below), whose sum is σ = 17812224. Its totient is φ = 8655360.

The previous prime is 12805193. The next prime is 12805217. The reversal of 12805205 is 50250821.

It is an interprime number because it is at equal distance from previous prime (12805193) and next prime (12805217).

It is not a de Polignac number, because 12805205 - 26 = 12805141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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, 92 + ... + 5061.

It is an arithmetic number, because the mean of its divisors is an integer number (1113264).

Almost surely, 212805205 is an apocalyptic number.

It is an amenable number.

12805205 is a deficient number, since it is larger than the sum of its proper divisors (5007019).

12805205 is an equidigital number, since it uses as much as digits as its factorization.

12805205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5236.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 12805205 is about 3578.4361109289. The cubic root of 12805205 is about 233.9531220775.

The spelling of 12805205 in words is "twelve million, eight hundred five thousand, two hundred five".

Divisors: 1 5 7 35 71 355 497 2485 5153 25765 36071 180355 365863 1829315 2561041 12805205