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305005 = 561001
BaseRepresentation
bin1001010011101101101
3120111101111
41022131231
534230010
610312021
72410141
oct1123555
9514344
10305005
11199178
12128611
13a8a9c
147d221
156058a
hex4a76d

305005 has 4 divisors (see below), whose sum is σ = 366012. Its totient is φ = 244000.

The previous prime is 304981. The next prime is 305017. The reversal of 305005 is 500503.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155236 + 149769 = 394^2 + 387^2 .

It is not a de Polignac number, because 305005 - 217 = 173933 is a prime.

It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30496 + ... + 30505.

It is an arithmetic number, because the mean of its divisors is an integer number (91503).

2305005 is an apocalyptic number.

It is an amenable number.

305005 is a deficient number, since it is larger than the sum of its proper divisors (61007).

305005 is an equidigital number, since it uses as much as digits as its factorization.

305005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61006.

The product of its (nonzero) digits is 75, while the sum is 13.

The square root of 305005 is about 552.2725776281. The cubic root of 305005 is about 67.3135228021.

Adding to 305005 its reverse (500503), we get a palindrome (805508).

The spelling of 305005 in words is "three hundred five thousand, five".

Divisors: 1 5 61001 305005