18004433 has 6 divisors (see below), whose sum is σ = 18217014. Its totient is φ = 17794304.

The previous prime is 18004417. The next prime is 18004463. The reversal of 18004433 is 33440081.

It can be written as a sum of positive squares in 3 ways, for example, as 1423249 + 16581184 = 1193^2 + 4072^2 .

It is not a de Polignac number, because 18004433 - 2⁴ = 18004417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18004399 and 18004408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18004463) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6785 + ... + 9057.

It is an arithmetic number, because the mean of its divisors is an integer number (3036169).

Almost surely, 2^18004433 is an apocalyptic number.

It is an amenable number.

18004433 is a deficient number, since it is larger than the sum of its proper divisors (212581).

18004433 is an frugal number, since it uses more digits than its factorization.

18004433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2451 (or 2362 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 18004433 is about 4243.1630890174. The cubic root of 18004433 is about 262.0956520005.

The spelling of 18004433 in words is "eighteen million, four thousand, four hundred thirty-three".