43009 has 4 divisors (see below), whose sum is σ = 44100. Its totient is φ = 41920.
The previous prime is 43003. The next prime is 43013. The reversal of 43009 is 90034.
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 19600 + 23409 = 140^2 + 153^2 .
It is a cyclic number.
It is not a de Polignac number, because 43009 - 211 = 40961 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 42983 and 43001.
It is not an unprimeable number, because it can be changed into a prime (43003) 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, 484 + ... + 565.
It is an arithmetic number, because the mean of its divisors is an integer number (11025).
It is a Proth number, since it is equal to 21 ⋅ 211 + 1 and 21 < 211.
243009 is an apocalyptic number.
It is an amenable number.
43009 is a deficient number, since it is larger than the sum of its proper divisors (1091).
43009 is a wasteful number, since it uses less digits than its factorization.
43009 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1090.
The product of its (nonzero) digits is 108, while the sum is 16.
The square root of 43009 is about 207.3861133249. The cubic root of 43009 is about 35.0364246646.
The spelling of 43009 in words is "forty-three thousand, nine".
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