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12708521 = 74342221
BaseRepresentation
bin110000011110…
…101010101001
3212220122210222
4300132222221
511223133041
61132215425
7213010040
oct60365251
925818728
1012708521
1171a0111
12430a575
13282c647
14198b557
1511b074b
hexc1eaa9

12708521 has 8 divisors (see below), whose sum is σ = 14862144. Its totient is φ = 10639440.

The previous prime is 12708517. The next prime is 12708523. The reversal of 12708521 is 12580721.

12708521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12708521 - 22 = 12708517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12708523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20810 + ... + 21411.

It is an arithmetic number, because the mean of its divisors is an integer number (1857768).

Almost surely, 212708521 is an apocalyptic number.

It is an amenable number.

12708521 is a deficient number, since it is larger than the sum of its proper divisors (2153623).

12708521 is an equidigital number, since it uses as much as digits as its factorization.

12708521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42271.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 12708521 is about 3564.9012609047. The cubic root of 12708521 is about 233.3628232569.

The spelling of 12708521 in words is "twelve million, seven hundred eight thousand, five hundred twenty-one".

Divisors: 1 7 43 301 42221 295547 1815503 12708521