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12145 = 57347
BaseRepresentation
bin10111101110001
3121122211
42331301
5342040
6132121
750260
oct27561
917584
1012145
119141
127041
1356b3
1445d7
1538ea
hex2f71

12145 has 8 divisors (see below), whose sum is σ = 16704. Its totient is φ = 8304.

The previous prime is 12143. The next prime is 12149. The reversal of 12145 is 54121.

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

It is a cyclic number.

It is not a de Polignac number, because 12145 - 21 = 12143 is a prime.

It is an Ulam number.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12143) 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, 139 + ... + 208.

It is an arithmetic number, because the mean of its divisors is an integer number (2088).

212145 is an apocalyptic number.

12145 is the 70-th heptagonal number.

It is an amenable number.

12145 is a deficient number, since it is larger than the sum of its proper divisors (4559).

12145 is an equidigital number, since it uses as much as digits as its factorization.

12145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359.

The product of its digits is 40, while the sum is 13.

The square root of 12145 is about 110.2043556308. The cubic root of 12145 is about 22.9861290024.

Adding to 12145 its reverse (54121), we get a palindrome (66266).

It can be divided in two parts, 121 and 45, that multiplied together give a palindrome (5445).

The spelling of 12145 in words is "twelve thousand, one hundred forty-five".

Divisors: 1 5 7 35 347 1735 2429 12145