18969009 has 4 divisors (see below), whose sum is σ = 25292016. Its totient is φ = 12646004.

The previous prime is 18969007. The next prime is 18969047. The reversal of 18969009 is 90096981.

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 not a de Polignac number, because 18969009 - 2¹ = 18969007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18969001) 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 in 3 ways as a sum of consecutive naturals, for example, 3161499 + ... + 3161504.

It is an arithmetic number, because the mean of its divisors is an integer number (6323004).

Almost surely, 2^18969009 is an apocalyptic number.

It is an amenable number.

18969009 is a deficient number, since it is larger than the sum of its proper divisors (6323007).

18969009 is an equidigital number, since it uses as much as digits as its factorization.

18969009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6323006.

The product of its (nonzero) digits is 34992, while the sum is 42.

The square root of 18969009 is about 4355.3425812443. The cubic root of 18969009 is about 266.6950044538.

The spelling of 18969009 in words is "eighteen million, nine hundred sixty-nine thousand, nine".