18238829 has 12 divisors (see below), whose sum is σ = 21289500. Its totient is φ = 15579648.

The previous prime is 18238811. The next prime is 18238849. The reversal of 18238829 is 92883281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10824100 + 7414729 = 3290^2 + 2723^2 .

It is not a de Polignac number, because 18238829 - 2²⁰ = 17190253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18238849) 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 in 11 ways as a sum of consecutive naturals, for example, 21587 + ... + 22415.

It is an arithmetic number, because the mean of its divisors is an integer number (1774125).

Almost surely, 2^18238829 is an apocalyptic number.

It is an amenable number.

18238829 is a deficient number, since it is larger than the sum of its proper divisors (3050671).

18238829 is an equidigital number, since it uses as much as digits as its factorization.

18238829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292 (or 1285 counting only the distinct ones).

The product of its digits is 55296, while the sum is 41.

The square root of 18238829 is about 4270.6942058640. The cubic root of 18238829 is about 263.2281413248.

The spelling of 18238829 in words is "eighteen million, two hundred thirty-eight thousand, eight hundred twenty-nine".