18837229 has 4 divisors (see below), whose sum is σ = 18857376. Its totient is φ = 18817084.

The previous prime is 18837209. The next prime is 18837233. The reversal of 18837229 is 92273881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92273881 = 7 ⋅13181983.

It is a cyclic number.

It is not a de Polignac number, because 18837229 - 2⁹ = 18836717 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18837191 and 18837200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18837209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8599 + ... + 10564.

It is an arithmetic number, because the mean of its divisors is an integer number (4714344).

Almost surely, 2^18837229 is an apocalyptic number.

It is an amenable number.

18837229 is a deficient number, since it is larger than the sum of its proper divisors (20147).

18837229 is an equidigital number, since it uses as much as digits as its factorization.

18837229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20146.

The product of its digits is 48384, while the sum is 40.

The square root of 18837229 is about 4340.1876687535. The cubic root of 18837229 is about 266.0759812717.

The spelling of 18837229 in words is "eighteen million, eight hundred thirty-seven thousand, two hundred twenty-nine".