18853009 has 4 divisors (see below), whose sum is σ = 21546304. Its totient is φ = 16159716.

The previous prime is 18852971. The next prime is 18853013. The reversal of 18853009 is 90035881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18853009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18853039) 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 3 ways as a sum of consecutive naturals, for example, 1346637 + ... + 1346650.

It is an arithmetic number, because the mean of its divisors is an integer number (5386576).

Almost surely, 2^18853009 is an apocalyptic number.

It is an amenable number.

18853009 is a deficient number, since it is larger than the sum of its proper divisors (2693295).

18853009 is an equidigital number, since it uses as much as digits as its factorization.

18853009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2693294.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18853009 is about 4342.0051819407. The cubic root of 18853009 is about 266.1502580689.

Adding to 18853009 its product of nonzero digits (8640), we get a square (18861649 = 4343²).

The spelling of 18853009 in words is "eighteen million, eight hundred fifty-three thousand, nine".