18906805 has 32 divisors (see below), whose sum is σ = 26438400. Its totient is φ = 12874752.

The previous prime is 18906787. The next prime is 18906817. The reversal of 18906805 is 50860981.

It is a cyclic number.

It is not a de Polignac number, because 18906805 - 2⁵ = 18906773 is a prime.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 36891 + ... + 37399.

It is an arithmetic number, because the mean of its divisors is an integer number (826200).

Almost surely, 2^18906805 is an apocalyptic number.

It is an amenable number.

18906805 is a deficient number, since it is larger than the sum of its proper divisors (7531595).

18906805 is a wasteful number, since it uses less digits than its factorization.

18906805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 18906805 is about 4348.1956027759. The cubic root of 18906805 is about 266.4031659286.

The spelling of 18906805 in words is "eighteen million, nine hundred six thousand, eight hundred five".