18288673 has 6 divisors (see below), whose sum is σ = 19803894. Its totient is φ = 16881696.

The previous prime is 18288649. The next prime is 18288689. The reversal of 18288673 is 37688281.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 589824 + 17698849 = 768^2 + 4207^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18288673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18288973) 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, 53940 + ... + 54277.

It is an arithmetic number, because the mean of its divisors is an integer number (3300649).

Almost surely, 2^18288673 is an apocalyptic number.

18288673 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18288673 is a deficient number, since it is larger than the sum of its proper divisors (1515221).

18288673 is a wasteful number, since it uses less digits than its factorization.

18288673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108243 (or 108230 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 18288673 is about 4276.5258095795. The cubic root of 18288673 is about 263.4677109742.

It can be divided in two parts, 1828 and 8673, that added together give a palindrome (10501).

The spelling of 18288673 in words is "eighteen million, two hundred eighty-eight thousand, six hundred seventy-three".