18858009 has 8 divisors (see below), whose sum is σ = 25249312. Its totient is φ = 12519360.

The previous prime is 18857989. The next prime is 18858019. The reversal of 18858009 is 90085881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18858009 - 2⁵ = 18857977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18858019) 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 7 ways as a sum of consecutive naturals, for example, 12319 + ... + 13764.

It is an arithmetic number, because the mean of its divisors is an integer number (3156164).

Almost surely, 2^18858009 is an apocalyptic number.

It is an amenable number.

18858009 is a deficient number, since it is larger than the sum of its proper divisors (6391303).

18858009 is a wasteful number, since it uses less digits than its factorization.

18858009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26327.

The product of its (nonzero) digits is 23040, while the sum is 39.

The square root of 18858009 is about 4342.5809146175. The cubic root of 18858009 is about 266.1737845285.

The spelling of 18858009 in words is "eighteen million, eight hundred fifty-eight thousand, nine".