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129818 = 2134993
BaseRepresentation
bin11111101100011010
320121002002
4133230122
513123233
62441002
71050323
oct375432
9217062
10129818
1189597
1263162
1347120
143544a
15286e8
hex1fb1a

129818 has 8 divisors (see below), whose sum is σ = 209748. Its totient is φ = 59904.

The previous prime is 129803. The next prime is 129841. The reversal of 129818 is 818921.

It can be written as a sum of positive squares in 2 ways, for example, as 120409 + 9409 = 347^2 + 97^2 .

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

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

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, 2471 + ... + 2522.

2129818 is an apocalyptic number.

129818 is a deficient number, since it is larger than the sum of its proper divisors (79930).

129818 is a wasteful number, since it uses less digits than its factorization.

129818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5008.

The product of its digits is 1152, while the sum is 29.

The square root of 129818 is about 360.3026505592. The cubic root of 129818 is about 50.6343187642.

The spelling of 129818 in words is "one hundred twenty-nine thousand, eight hundred eighteen".

Divisors: 1 2 13 26 4993 9986 64909 129818