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12131320 = 235303283
BaseRepresentation
bin101110010001…
…101111111000
3211211100001011
4232101233320
511101200240
61112003304
7205054165
oct56215770
924740034
1012131320
116936493
124090534
1326899c6
14187b06c
1510e96ea
hexb91bf8

12131320 has 16 divisors (see below), whose sum is σ = 27295560. Its totient is φ = 4852512.

The previous prime is 12131303. The next prime is 12131321. The reversal of 12131320 is 2313121.

It is a self number, because there is not a number n which added to its sum of digits gives 12131320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131321) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151602 + ... + 151681.

Almost surely, 212131320 is an apocalyptic number.

12131320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12131320 is an abundant number, since it is smaller than the sum of its proper divisors (15164240).

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

12131320 is a wasteful number, since it uses less digits than its factorization.

12131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303294 (or 303290 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 12131320 is about 3483.0044501838. The cubic root of 12131320 is about 229.7749531544.

Adding to 12131320 its reverse (2313121), we get a palindrome (14444441).

The spelling of 12131320 in words is "twelve million, one hundred thirty-one thousand, three hundred twenty".

Divisors: 1 2 4 5 8 10 20 40 303283 606566 1213132 1516415 2426264 3032830 6065660 12131320