18447009 has 16 divisors (see below), whose sum is σ = 28175232. Its totient is φ = 10516608.

The previous prime is 18447001. The next prime is 18447061. The reversal of 18447009 is 90074481.

It is not a de Polignac number, because 18447009 - 2³ = 18447001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18447001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12157 + ... + 13589.

It is an arithmetic number, because the mean of its divisors is an integer number (1760952).

Almost surely, 2^18447009 is an apocalyptic number.

It is an amenable number.

18447009 is a deficient number, since it is larger than the sum of its proper divisors (9728223).

18447009 is a wasteful number, since it uses less digits than its factorization.

18447009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18447009 is about 4294.9981373686. The cubic root of 18447009 is about 264.2258598601.

The spelling of 18447009 in words is "eighteen million, four hundred forty-seven thousand, nine".