18680806 has 8 divisors (see below), whose sum is σ = 28439640. Its totient is φ = 9200928.

The previous prime is 18680803. The next prime is 18680861. The reversal of 18680806 is 60808681.

18680806 = T₇₁₃ + T₇₁₄ + ... + T₇₇₉.

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

It is a super-3 number, since 3×18680806³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18680803) 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 3 ways as a sum of consecutive naturals, for example, 69571 + ... + 69838.

It is an arithmetic number, because the mean of its divisors is an integer number (3554955).

Almost surely, 2^18680806 is an apocalyptic number.

18680806 is a deficient number, since it is larger than the sum of its proper divisors (9758834).

18680806 is a wasteful number, since it uses less digits than its factorization.

18680806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139478.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 18680806 is about 4322.1297990690. The cubic root of 18680806 is about 265.3374412608.

The spelling of 18680806 in words is "eighteen million, six hundred eighty thousand, eight hundred six".