18500845 has 32 divisors (see below), whose sum is σ = 26251776. Its totient is φ = 12364800.

The previous prime is 18500827. The next prime is 18500849. The reversal of 18500845 is 54800581.

It is not a de Polignac number, because 18500845 - 2¹⁷ = 18369773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18500849) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 43735 + ... + 44155.

It is an arithmetic number, because the mean of its divisors is an integer number (820368).

Almost surely, 2^18500845 is an apocalyptic number.

It is an amenable number.

18500845 is a deficient number, since it is larger than the sum of its proper divisors (7750931).

18500845 is a wasteful number, since it uses less digits than its factorization.

18500845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 501.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 18500845 is about 4301.2608616544. The cubic root of 18500845 is about 264.4826503200.

The spelling of 18500845 in words is "eighteen million, five hundred thousand, eight hundred forty-five".