18835409 has 2 divisors, whose sum is σ = 18835410. Its totient is φ = 18835408.

The previous prime is 18835393. The next prime is 18835451. The reversal of 18835409 is 90453881.

18835409 is nontrivially palindromic in base 4.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12759184 + 6076225 = 3572^2 + 2465^2 .

It is a cyclic number.

It is not a de Polignac number, because 18835409 - 2⁴ = 18835393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18835469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9417704 + 9417705.

It is an arithmetic number, because the mean of its divisors is an integer number (9417705).

Almost surely, 2^18835409 is an apocalyptic number.

It is an amenable number.

18835409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18835409 is an equidigital number, since it uses as much as digits as its factorization.

18835409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 18835409 is about 4339.9779953359. The cubic root of 18835409 is about 266.0674118251.

The spelling of 18835409 in words is "eighteen million, eight hundred thirty-five thousand, four hundred nine".