18912117 has 8 divisors (see below), whose sum is σ = 28818496. Its totient is φ = 10806912.

The previous prime is 18912107. The next prime is 18912119. The reversal of 18912117 is 71121981.

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

It is not a de Polignac number, because 18912117 - 2⁶ = 18912053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18912119) 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, 450268 + ... + 450309.

It is an arithmetic number, because the mean of its divisors is an integer number (3602312).

Almost surely, 2^18912117 is an apocalyptic number.

It is an amenable number.

18912117 is a deficient number, since it is larger than the sum of its proper divisors (9906379).

18912117 is an equidigital number, since it uses as much as digits as its factorization.

18912117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900587.

The product of its digits is 1008, while the sum is 30.

The square root of 18912117 is about 4348.8063879644. The cubic root of 18912117 is about 266.4281128742.

The spelling of 18912117 in words is "eighteen million, nine hundred twelve thousand, one hundred seventeen".