18289813 has 16 divisors (see below), whose sum is σ = 19498752. Its totient is φ = 17136000.

The previous prime is 18289811. The next prime is 18289829. The reversal of 18289813 is 31898281.

It is a cyclic number.

It is not a de Polignac number, because 18289813 - 2¹ = 18289811 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 (18289811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 177520 + ... + 177622.

It is an arithmetic number, because the mean of its divisors is an integer number (1218672).

Almost surely, 2^18289813 is an apocalyptic number.

It is an amenable number.

18289813 is a deficient number, since it is larger than the sum of its proper divisors (1208939).

18289813 is a wasteful number, since it uses less digits than its factorization.

18289813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276.

The product of its digits is 27648, while the sum is 40.

The square root of 18289813 is about 4276.6590932643. The cubic root of 18289813 is about 263.4731851631.

The spelling of 18289813 in words is "eighteen million, two hundred eighty-nine thousand, eight hundred thirteen".