18680817 has 8 divisors (see below), whose sum is σ = 25711360. Its totient is φ = 12052080.

The previous prime is 18680803. The next prime is 18680861. The reversal of 18680817 is 71808681.

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

It is not a de Polignac number, because 18680817 - 2¹¹ = 18678769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18680897) 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 7 ways as a sum of consecutive naturals, for example, 100342 + ... + 100527.

It is an arithmetic number, because the mean of its divisors is an integer number (3213920).

Almost surely, 2^18680817 is an apocalyptic number.

It is an amenable number.

18680817 is a deficient number, since it is larger than the sum of its proper divisors (7030543).

18680817 is a wasteful number, since it uses less digits than its factorization.

18680817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200903.

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 18680817 is about 4322.1310715896. The cubic root of 18680817 is about 265.3374933412.

It can be divided in two parts, 186 and 80817, that added together give a triangular number (81003 = T₄₀₂).

The spelling of 18680817 in words is "eighteen million, six hundred eighty thousand, eight hundred seventeen".