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12917870 = 257241643
BaseRepresentation
bin110001010001…
…110001101110
3220022021222122
4301101301232
511301332440
61140512542
7214541300
oct61216156
926267878
1012917870
117323429
1243ab752
1328a3a14
141a03970
1512027b5
hexc51c6e

12917870 has 48 divisors (see below), whose sum is σ = 27751248. Its totient is φ = 4314240.

The previous prime is 12917833. The next prime is 12917939. The reversal of 12917870 is 7871921.

12917870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 12917870.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19769 + ... + 20411.

It is an arithmetic number, because the mean of its divisors is an integer number (578151).

Almost surely, 212917870 is an apocalyptic number.

12917870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12917870 is an abundant number, since it is smaller than the sum of its proper divisors (14833378).

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

12917870 is a wasteful number, since it uses less digits than its factorization.

12917870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 698 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 12917870 is about 3594.1438479838. The cubic root of 12917870 is about 234.6372553568.

The spelling of 12917870 in words is "twelve million, nine hundred seventeen thousand, eight hundred seventy".

Divisors: 1 2 5 7 10 14 35 41 49 70 82 98 205 245 287 410 490 574 643 1286 1435 2009 2870 3215 4018 4501 6430 9002 10045 20090 22505 26363 31507 45010 52726 63014 131815 157535 184541 263630 315070 369082 922705 1291787 1845410 2583574 6458935 12917870