Search a number
-
+
30185 = 56037
BaseRepresentation
bin111010111101001
31112101222
413113221
51431220
6351425
7154001
oct72751
945358
1030185
1120751
1215575
131097c
14b001
158e25
hex75e9

30185 has 4 divisors (see below), whose sum is σ = 36228. Its totient is φ = 24144.

The previous prime is 30181. The next prime is 30187. The reversal of 30185 is 58103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58103 = 97599.

It can be written as a sum of positive squares in 2 ways, for example, as 8281 + 21904 = 91^2 + 148^2 .

It is a cyclic number.

It is not a de Polignac number, because 30185 - 22 = 30181 is a prime.

It is a super-2 number, since 2×301852 = 1822268450, which contains 22 as substring.

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

It is a Duffinian number.

30185 is a modest number, since divided by 185 gives 30 as remainder.

It is not an unprimeable number, because it can be changed into a prime (30181) 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, 3014 + ... + 3023.

It is an arithmetic number, because the mean of its divisors is an integer number (9057).

230185 is an apocalyptic number.

It is an amenable number.

30185 is a deficient number, since it is larger than the sum of its proper divisors (6043).

30185 is an equidigital number, since it uses as much as digits as its factorization.

30185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6042.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 30185 is about 173.7383089592. The cubic root of 30185 is about 31.1360651077.

Adding to 30185 its reverse (58103), we get a palindrome (88288).

The spelling of 30185 in words is "thirty thousand, one hundred eighty-five".

Divisors: 1 5 6037 30185