18649609 has 12 divisors (see below), whose sum is σ = 20769280. Its totient is φ = 16731000.

The previous prime is 18649607. The next prime is 18649613. The reversal of 18649609 is 90694681.

It is not a de Polignac number, because 18649609 - 2¹ = 18649607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18649601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8584 + ... + 10534.

Almost surely, 2^18649609 is an apocalyptic number.

It is an amenable number.

18649609 is a deficient number, since it is larger than the sum of its proper divisors (2119671).

18649609 is a wasteful number, since it uses less digits than its factorization.

18649609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2052 (or 2041 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 18649609 is about 4318.5193064290. The cubic root of 18649609 is about 265.1896541975.

The spelling of 18649609 in words is "eighteen million, six hundred forty-nine thousand, six hundred nine".