18798117 has 16 divisors (see below), whose sum is σ = 27151488. Its totient is φ = 11499840.

The previous prime is 18798113. The next prime is 18798133. The reversal of 18798117 is 71189781.

It is a happy number.

It is not a de Polignac number, because 18798117 - 2² = 18798113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18798113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5728 + ... + 8390.

It is an arithmetic number, because the mean of its divisors is an integer number (1696968).

Almost surely, 2^18798117 is an apocalyptic number.

It is an amenable number.

18798117 is a deficient number, since it is larger than the sum of its proper divisors (8353371).

18798117 is a wasteful number, since it uses less digits than its factorization.

18798117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860.

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

The square root of 18798117 is about 4335.6795315152. The cubic root of 18798117 is about 265.8917012542.

It can be divided in two parts, 18798 and 117, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18798117 in words is "eighteen million, seven hundred ninety-eight thousand, one hundred seventeen".