18810229 has 2 divisors, whose sum is σ = 18810230. Its totient is φ = 18810228.

The previous prime is 18810227. The next prime is 18810263. The reversal of 18810229 is 92201881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15563025 + 3247204 = 3945^2 + 1802^2 .

It is a cyclic number.

It is not a de Polignac number, because 18810229 - 2¹ = 18810227 is a prime.

Together with 18810227, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18810229.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18810227) 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, 9405114 + 9405115.

It is an arithmetic number, because the mean of its divisors is an integer number (9405115).

Almost surely, 2^18810229 is an apocalyptic number.

It is an amenable number.

18810229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18810229 is an equidigital number, since it uses as much as digits as its factorization.

18810229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18810229 is about 4337.0760887953. The cubic root of 18810229 is about 265.9487954277.

The spelling of 18810229 in words is "eighteen million, eight hundred ten thousand, two hundred twenty-nine".