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12387 = 34129
BaseRepresentation
bin11000001100011
3121222210
43001203
5344022
6133203
751054
oct30143
917883
1012387
119341
127203
13583b
14472b
153a0c
hex3063

12387 has 4 divisors (see below), whose sum is σ = 16520. Its totient is φ = 8256.

The previous prime is 12379. The next prime is 12391. The reversal of 12387 is 78321.

It can be divided in two parts, 123 and 87, that multiplied together give a palindrome (10701).

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78321 = 326107.

It is not a de Polignac number, because 12387 - 23 = 12379 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (12347) 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, 2062 + ... + 2067.

It is an arithmetic number, because the mean of its divisors is an integer number (4130).

212387 is an apocalyptic number.

12387 is a deficient number, since it is larger than the sum of its proper divisors (4133).

12387 is an equidigital number, since it uses as much as digits as its factorization.

12387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4132.

The product of its digits is 336, while the sum is 21.

The square root of 12387 is about 111.2969002264. The cubic root of 12387 is about 23.1377990993.

The spelling of 12387 in words is "twelve thousand, three hundred eighty-seven".

Divisors: 1 3 4129 12387