18872117 has 8 divisors (see below), whose sum is σ = 20620992. Its totient is φ = 17128800.

The previous prime is 18872093. The next prime is 18872123. The reversal of 18872117 is 71127881.

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 18872117 - 2⁶ = 18872053 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 (18872317) 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, 9392 + ... + 11222.

It is an arithmetic number, because the mean of its divisors is an integer number (2577624).

Almost surely, 2^18872117 is an apocalyptic number.

It is an amenable number.

18872117 is a deficient number, since it is larger than the sum of its proper divisors (1748875).

18872117 is a wasteful number, since it uses less digits than its factorization.

18872117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2779.

The product of its digits is 6272, while the sum is 35.

The square root of 18872117 is about 4344.2049905593. The cubic root of 18872117 is about 266.2401443742.

Adding to 18872117 its reverse (71127881), we get a palindrome (89999998).

It can be divided in two parts, 1887 and 2117, that added together give a palindrome (4004).

The spelling of 18872117 in words is "eighteen million, eight hundred seventy-two thousand, one hundred seventeen".