18838829 has 2 divisors, whose sum is σ = 18838830. Its totient is φ = 18838828.

The previous prime is 18838819. The next prime is 18838843. The reversal of 18838829 is 92883881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18472804 + 366025 = 4298^2 + 605^2 .

It is an emirp because it is prime and its reverse (92883881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18838829 - 2²⁴ = 2061613 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18838819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9419414 + 9419415.

It is an arithmetic number, because the mean of its divisors is an integer number (9419415).

Almost surely, 2^18838829 is an apocalyptic number.

It is an amenable number.

18838829 is a deficient number, since it is larger than the sum of its proper divisors (1).

18838829 is an equidigital number, since it uses as much as digits as its factorization.

18838829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 221184, while the sum is 47.

The square root of 18838829 is about 4340.3719886664. The cubic root of 18838829 is about 266.0835143952.

The spelling of 18838829 in words is "eighteen million, eight hundred thirty-eight thousand, eight hundred twenty-nine".