18179389 has 2 divisors, whose sum is σ = 18179390. Its totient is φ = 18179388.

The previous prime is 18179377. The next prime is 18179437. The reversal of 18179389 is 98397181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16402500 + 1776889 = 4050^2 + 1333^2 .

It is a cyclic number.

It is not a de Polignac number, because 18179389 - 2⁷ = 18179261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18179309) 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 as a sum of consecutive naturals, namely, 9089694 + 9089695.

It is an arithmetic number, because the mean of its divisors is an integer number (9089695).

Almost surely, 2^18179389 is an apocalyptic number.

It is an amenable number.

18179389 is a deficient number, since it is larger than the sum of its proper divisors (1).

18179389 is an equidigital number, since it uses as much as digits as its factorization.

18179389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 46.

The square root of 18179389 is about 4263.7294707802. The cubic root of 18179389 is about 262.9418782733.

The spelling of 18179389 in words is "eighteen million, one hundred seventy-nine thousand, three hundred eighty-nine".