18829409 has 2 divisors, whose sum is σ = 18829410. Its totient is φ = 18829408.

The previous prime is 18829379. The next prime is 18829453. The reversal of 18829409 is 90492881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18515809 + 313600 = 4303^2 + 560^2 .

It is an emirp because it is prime and its reverse (90492881) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18829409 - 2¹⁶ = 18763873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18829009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9414704 + 9414705.

It is an arithmetic number, because the mean of its divisors is an integer number (9414705).

Almost surely, 2^18829409 is an apocalyptic number.

It is an amenable number.

18829409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18829409 is an equidigital number, since it uses as much as digits as its factorization.

18829409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 18829409 is about 4339.2866925337. The cubic root of 18829409 is about 266.0391569921.

The spelling of 18829409 in words is "eighteen million, eight hundred twenty-nine thousand, four hundred nine".