18019673 has 4 divisors (see below), whose sum is σ = 20593920. Its totient is φ = 15445428.

The previous prime is 18019669. The next prime is 18019691. The reversal of 18019673 is 37691081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18019673 - 2² = 18019669 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18019693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1287113 + ... + 1287126.

It is an arithmetic number, because the mean of its divisors is an integer number (5148480).

Almost surely, 2^18019673 is an apocalyptic number.

It is an amenable number.

18019673 is a deficient number, since it is larger than the sum of its proper divisors (2574247).

18019673 is an equidigital number, since it uses as much as digits as its factorization.

18019673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2574246.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 18019673 is about 4244.9585392557. The cubic root of 18019673 is about 262.1695821497.

The spelling of 18019673 in words is "eighteen million, nineteen thousand, six hundred seventy-three".