18936806 has 16 divisors (see below), whose sum is σ = 34172160. Its totient is φ = 7688520.

The previous prime is 18936803. The next prime is 18936811. The reversal of 18936806 is 60863981.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18936803) 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, 35330 + ... + 35861.

It is an arithmetic number, because the mean of its divisors is an integer number (2135760).

Almost surely, 2^18936806 is an apocalyptic number.

18936806 is a deficient number, since it is larger than the sum of its proper divisors (15235354).

18936806 is a wasteful number, since it uses less digits than its factorization.

18936806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71219.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18936806 is about 4351.6440571352. The cubic root of 18936806 is about 266.5439994843.

The spelling of 18936806 in words is "eighteen million, nine hundred thirty-six thousand, eight hundred six".