18478529 has 2 divisors, whose sum is σ = 18478530. Its totient is φ = 18478528.

The previous prime is 18478517. The next prime is 18478549. The reversal of 18478529 is 92587481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14047504 + 4431025 = 3748^2 + 2105^2 .

It is a cyclic number.

It is not a de Polignac number, because 18478529 - 2⁴ = 18478513 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18478529.

It is not a weakly prime, because it can be changed into another prime (18478549) 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, 9239264 + 9239265.

It is an arithmetic number, because the mean of its divisors is an integer number (9239265).

Almost surely, 2^18478529 is an apocalyptic number.

It is an amenable number.

18478529 is a deficient number, since it is larger than the sum of its proper divisors (1).

18478529 is an equidigital number, since it uses as much as digits as its factorization.

18478529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 161280, while the sum is 44.

The square root of 18478529 is about 4298.6659558519. The cubic root of 18478529 is about 264.3762665391.

The spelling of 18478529 in words is "eighteen million, four hundred seventy-eight thousand, five hundred twenty-nine".