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405005 = 581001
BaseRepresentation
bin1100010111000001101
3202120120012
41202320031
5100430010
612403005
73304526
oct1427015
9676505
10405005
11257317
12176465
13112463
14a784d
1580005
hex62e0d

405005 has 4 divisors (see below), whose sum is σ = 486012. Its totient is φ = 324000.

The previous prime is 405001. The next prime is 405011. The reversal of 405005 is 500504.

Adding to 405005 its reverse (500504), we get a palindrome (905509).

It can be divided in two parts, 40500 and 5, that multiplied together give a square (202500 = 4502).

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 259081 + 145924 = 509^2 + 382^2 .

It is not a de Polignac number, because 405005 - 22 = 405001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405001) 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, 40496 + ... + 40505.

It is an arithmetic number, because the mean of its divisors is an integer number (121503).

2405005 is an apocalyptic number.

It is an amenable number.

405005 is a deficient number, since it is larger than the sum of its proper divisors (81007).

405005 is an equidigital number, since it uses as much as digits as its factorization.

405005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81006.

The product of its (nonzero) digits is 100, while the sum is 14.

The square root of 405005 is about 636.4000314268. The cubic root of 405005 is about 73.9866666993.

The spelling of 405005 in words is "four hundred five thousand, five".

Divisors: 1 5 81001 405005