18506805 has 16 divisors (see below), whose sum is σ = 30170880. Its totient is φ = 9683648.

The previous prime is 18506791. The next prime is 18506833. The reversal of 18506805 is 50860581.

It is a cyclic number.

It is not a de Polignac number, because 18506805 - 2¹² = 18502709 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10845 + ... + 12434.

It is an arithmetic number, because the mean of its divisors is an integer number (1885680).

Almost surely, 2^18506805 is an apocalyptic number.

18506805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18506805 is a deficient number, since it is larger than the sum of its proper divisors (11664075).

18506805 is a wasteful number, since it uses less digits than its factorization.

18506805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23340.

The product of its (nonzero) digits is 9600, while the sum is 33.

The square root of 18506805 is about 4301.9536259704. The cubic root of 18506805 is about 264.5110480744.

The spelling of 18506805 in words is "eighteen million, five hundred six thousand, eight hundred five".