18853409 has 2 divisors, whose sum is σ = 18853410. Its totient is φ = 18853408.

The previous prime is 18853397. The next prime is 18853421. The reversal of 18853409 is 90435881.

It is a balanced prime because it is at equal distance from previous prime (18853397) and next prime (18853421).

It can be written as a sum of positive squares in only one way, i.e., 11751184 + 7102225 = 3428^2 + 2665^2 .

It is a cyclic number.

It is not a de Polignac number, because 18853409 - 2²⁰ = 17804833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18853469) 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 as a sum of consecutive naturals, namely, 9426704 + 9426705.

It is an arithmetic number, because the mean of its divisors is an integer number (9426705).

Almost surely, 2^18853409 is an apocalyptic number.

It is an amenable number.

18853409 is a deficient number, since it is larger than the sum of its proper divisors (1).

18853409 is an equidigital number, since it uses as much as digits as its factorization.

18853409 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 18853409 is about 4342.0512433641. The cubic root of 18853409 is about 266.1521403387.

The spelling of 18853409 in words is "eighteen million, eight hundred fifty-three thousand, four hundred nine".