18043037 has 4 divisors (see below), whose sum is σ = 18174876. Its totient is φ = 17911200.

The previous prime is 18043019. The next prime is 18043057. The reversal of 18043037 is 73034081.

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 9156676 + 8886361 = 3026^2 + 2981^2 .

It is a cyclic number.

It is not a de Polignac number, because 18043037 - 2⁸ = 18042781 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18042997 and 18043015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18043057) by changing a digit.

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, 65714 + ... + 65987.

It is an arithmetic number, because the mean of its divisors is an integer number (4543719).

Almost surely, 2^18043037 is an apocalyptic number.

It is an amenable number.

18043037 is a deficient number, since it is larger than the sum of its proper divisors (131839).

18043037 is a wasteful number, since it uses less digits than its factorization.

18043037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131838.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 18043037 is about 4247.7096181354. The cubic root of 18043037 is about 262.2828414134.

The spelling of 18043037 in words is "eighteen million, forty-three thousand, thirty-seven".