18897117 has 8 divisors (see below), whose sum is σ = 25249440. Its totient is φ = 12571440.

The previous prime is 18897113. The next prime is 18897119. The reversal of 18897117 is 71179881.

It is a happy number.

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

It is not a de Polignac number, because 18897117 - 2² = 18897113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897113) 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, 4942 + ... + 7887.

It is an arithmetic number, because the mean of its divisors is an integer number (3156180).

Almost surely, 2^18897117 is an apocalyptic number.

It is an amenable number.

18897117 is a deficient number, since it is larger than the sum of its proper divisors (6352323).

18897117 is a wasteful number, since it uses less digits than its factorization.

18897117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13323.

The product of its digits is 28224, while the sum is 42.

The square root of 18897117 is about 4347.0814347100. The cubic root of 18897117 is about 266.3576557746.

The spelling of 18897117 in words is "eighteen million, eight hundred ninety-seven thousand, one hundred seventeen".