18056805 has 48 divisors (see below), whose sum is σ = 33203520. Its totient is φ = 8346624.

The previous prime is 18056803. The next prime is 18056809. The reversal of 18056805 is 50865081.

18056805 = T₂₇₀ + T₂₇₁ + ... + T₅₀₃.

It is not a de Polignac number, because 18056805 - 2¹ = 18056803 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18056803) 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 in 47 ways as a sum of consecutive naturals, for example, 42886 + ... + 43304.

It is an arithmetic number, because the mean of its divisors is an integer number (691740).

Almost surely, 2^18056805 is an apocalyptic number.

18056805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18056805 is a deficient number, since it is larger than the sum of its proper divisors (15146715).

18056805 is a wasteful number, since it uses less digits than its factorization.

18056805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470 (or 457 counting only the distinct ones).

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

The square root of 18056805 is about 4249.3299471799. The cubic root of 18056805 is about 262.3495373554.

The spelling of 18056805 in words is "eighteen million, fifty-six thousand, eight hundred five".