18000673 has 8 divisors (see below), whose sum is σ = 18380520. Its totient is φ = 17623680.

The previous prime is 18000649. The next prime is 18000679. The reversal of 18000673 is 37600081.

18000673 = 322² + 323² + ... + 443².

It can be written as a sum of positive squares in 4 ways, for example, as 1411344 + 16589329 = 1188^2 + 4073^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18000673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18000679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15861 + ... + 16957.

It is an arithmetic number, because the mean of its divisors is an integer number (2297565).

Almost surely, 2^18000673 is an apocalyptic number.

It is an amenable number.

18000673 is a deficient number, since it is larger than the sum of its proper divisors (379847).

18000673 is a wasteful number, since it uses less digits than its factorization.

18000673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 18000673 is about 4242.7200001886. The cubic root of 18000673 is about 262.0774056005.

The spelling of 18000673 in words is "eighteen million, six hundred seventy-three", and thus it is an aban number.