18849609 has 24 divisors (see below), whose sum is σ = 28416960. Its totient is φ = 12029472.

The previous prime is 18849601. The next prime is 18849619. The reversal of 18849609 is 90694881.

It is not a de Polignac number, because 18849609 - 2³ = 18849601 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18849601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20052 + ... + 20970.

It is an arithmetic number, because the mean of its divisors is an integer number (1184040).

Almost surely, 2^18849609 is an apocalyptic number.

It is an amenable number.

18849609 is a deficient number, since it is larger than the sum of its proper divisors (9567351).

18849609 is a wasteful number, since it uses less digits than its factorization.

18849609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021 (or 1018 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 18849609 is about 4341.6136401112. The cubic root of 18849609 is about 266.1342577003.

The spelling of 18849609 in words is "eighteen million, eight hundred forty-nine thousand, six hundred nine".