18266805 has 24 divisors (see below), whose sum is σ = 32025240. Its totient is φ = 9630720.

The previous prime is 18266797. The next prime is 18266827. The reversal of 18266805 is 50866281.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 93636 + 18173169 = 306^2 + 4263^2 .

It is not a de Polignac number, because 18266805 - 2³ = 18266797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18266805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1725 + ... + 6285.

It is an arithmetic number, because the mean of its divisors is an integer number (1334385).

Almost surely, 2^18266805 is an apocalyptic number.

18266805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18266805 is a deficient number, since it is larger than the sum of its proper divisors (13758435).

18266805 is a wasteful number, since it uses less digits than its factorization.

18266805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661 (or 4658 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 18266805 is about 4273.9682965600. The cubic root of 18266805 is about 263.3626585227.

The spelling of 18266805 in words is "eighteen million, two hundred sixty-six thousand, eight hundred five".