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102009 = 337919
BaseRepresentation
bin11000111001111001
312011221010
4120321321
511231014
62104133
7603255
oct307171
9164833
10102009
116a706
124b049
133757b
1429265
1520359
hex18e79

102009 has 8 divisors (see below), whose sum is σ = 139840. Its totient is φ = 66096.

The previous prime is 102001. The next prime is 102013. The reversal of 102009 is 900201.

It is a happy number.

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

It is not a de Polignac number, because 102009 - 23 = 102001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 101985 and 102003.

It is not an unprimeable number, because it can be changed into a prime (102001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349 + ... + 570.

It is an arithmetic number, because the mean of its divisors is an integer number (17480).

2102009 is an apocalyptic number.

It is an amenable number.

102009 is a deficient number, since it is larger than the sum of its proper divisors (37831).

102009 is an equidigital number, since it uses as much as digits as its factorization.

102009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 102009 is about 319.3884781892. The cubic root of 102009 is about 46.7246614575.

The spelling of 102009 in words is "one hundred two thousand, nine".

Divisors: 1 3 37 111 919 2757 34003 102009