18004037 has 4 divisors (see below), whose sum is σ = 19063116. Its totient is φ = 16944960.

The previous prime is 18004033. The next prime is 18004061. The reversal of 18004037 is 73040081.

It is a happy number.

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 13535041 + 4468996 = 3679^2 + 2114^2 .

It is a cyclic number.

It is not a de Polignac number, because 18004037 - 2² = 18004033 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18004033) 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, 529514 + ... + 529547.

It is an arithmetic number, because the mean of its divisors is an integer number (4765779).

Almost surely, 2^18004037 is an apocalyptic number.

18004037 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18004037 is a deficient number, since it is larger than the sum of its proper divisors (1059079).

18004037 is a wasteful number, since it uses less digits than its factorization.

18004037 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1059078.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 18004037 is about 4243.1164254590. The cubic root of 18004037 is about 262.0937304249.

The spelling of 18004037 in words is "eighteen million, four thousand, thirty-seven".