18906686 has 16 divisors (see below), whose sum is σ = 30314736. Its totient is φ = 8812416.

The previous prime is 18906659. The next prime is 18906697. The reversal of 18906686 is 68660981.

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 7 ways as a sum of consecutive naturals, for example, 1040 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (1894671).

Almost surely, 2^18906686 is an apocalyptic number.

18906686 is a deficient number, since it is larger than the sum of its proper divisors (11408050).

18906686 is a wasteful number, since it uses less digits than its factorization.

18906686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5323.

The product of its (nonzero) digits is 124416, while the sum is 44.

The square root of 18906686 is about 4348.1819189174. The cubic root of 18906686 is about 266.4026070110.

The spelling of 18906686 in words is "eighteen million, nine hundred six thousand, six hundred eighty-six".