40043 has 4 divisors (see below), whose sum is σ = 41808. Its totient is φ = 38280.
The previous prime is 40039. The next prime is 40063. The reversal of 40043 is 34004.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 40043 - 22 = 40039 is a prime.
It is a magnanimous number.
It is a Duffinian number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 40043.
It is not an unprimeable number, because it can be changed into a prime (40013) 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, 848 + ... + 893.
It is an arithmetic number, because the mean of its divisors is an integer number (10452).
240043 is an apocalyptic number.
40043 is a deficient number, since it is larger than the sum of its proper divisors (1765).
40043 is a wasteful number, since it uses less digits than its factorization.
40043 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1764.
The product of its (nonzero) digits is 48, while the sum is 11.
The square root of 40043 is about 200.1074711249. The cubic root of 40043 is about 34.2117693725.
Adding to 40043 its reverse (34004), we get a palindrome (74047).
The spelling of 40043 in words is "forty thousand, forty-three", and thus it is an iban number.
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