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109405 = 521881
BaseRepresentation
bin11010101101011101
312120002001
4122231131
512000110
62202301
7633652
oct325535
9176061
10109405
117521a
1253391
133aa4a
142bc29
152263a
hex1ab5d

109405 has 4 divisors (see below), whose sum is σ = 131292. Its totient is φ = 87520.

The previous prime is 109397. The next prime is 109423. The reversal of 109405 is 504901.

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 13924 + 95481 = 118^2 + 309^2 .

It is not a de Polignac number, because 109405 - 23 = 109397 is a prime.

It is a Duffinian number.

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, 10936 + ... + 10945.

It is an arithmetic number, because the mean of its divisors is an integer number (32823).

2109405 is an apocalyptic number.

It is an amenable number.

109405 is a deficient number, since it is larger than the sum of its proper divisors (21887).

109405 is an equidigital number, since it uses as much as digits as its factorization.

109405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21886.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 109405 is about 330.7642665102. The cubic root of 109405 is about 47.8276515837.

The spelling of 109405 in words is "one hundred nine thousand, four hundred five".

Divisors: 1 5 21881 109405