18500806 has 4 divisors (see below), whose sum is σ = 27751212. Its totient is φ = 9250402.

The previous prime is 18500803. The next prime is 18500827. The reversal of 18500806 is 60800581.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500803) by changing a digit.

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 as a sum of consecutive naturals, namely, 4625200 + ... + 4625203.

It is an arithmetic number, because the mean of its divisors is an integer number (6937803).

Almost surely, 2^18500806 is an apocalyptic number.

18500806 is a deficient number, since it is larger than the sum of its proper divisors (9250406).

18500806 is an equidigital number, since it uses as much as digits as its factorization.

18500806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9250405.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18500806 is about 4301.2563280976. The cubic root of 18500806 is about 264.4824644757.

It can be divided in two parts, 18500 and 806, that added together give a triangular number (19306 = T₁₉₆).

The spelling of 18500806 in words is "eighteen million, five hundred thousand, eight hundred six".