18673229 has 2 divisors, whose sum is σ = 18673230. Its totient is φ = 18673228.

The previous prime is 18673211. The next prime is 18673231. The reversal of 18673229 is 92237681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13520329 + 5152900 = 3677^2 + 2270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18673229 is a prime.

Together with 18673231, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18673192 and 18673201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18673729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9336614 + 9336615.

It is an arithmetic number, because the mean of its divisors is an integer number (9336615).

Almost surely, 2^18673229 is an apocalyptic number.

It is an amenable number.

18673229 is a deficient number, since it is larger than the sum of its proper divisors (1).

18673229 is an equidigital number, since it uses as much as digits as its factorization.

18673229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 38.

The square root of 18673229 is about 4321.2531747168. The cubic root of 18673229 is about 265.3015624793.

The spelling of 18673229 in words is "eighteen million, six hundred seventy-three thousand, two hundred twenty-nine".