18869917 has 8 divisors (see below), whose sum is σ = 21249792. Its totient is φ = 16600800.

The previous prime is 18869891. The next prime is 18869927. The reversal of 18869917 is 71996881.

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

It is a cyclic number.

It is not a de Polignac number, because 18869917 - 2¹¹ = 18867869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18869927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27328 + ... + 28009.

It is an arithmetic number, because the mean of its divisors is an integer number (2656224).

Almost surely, 2^18869917 is an apocalyptic number.

It is an amenable number.

18869917 is a deficient number, since it is larger than the sum of its proper divisors (2379875).

18869917 is a wasteful number, since it uses less digits than its factorization.

18869917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55379.

The product of its digits is 217728, while the sum is 49.

The square root of 18869917 is about 4343.9517722921. The cubic root of 18869917 is about 266.2297984041.

The spelling of 18869917 in words is "eighteen million, eight hundred sixty-nine thousand, nine hundred seventeen".