18031845 has 32 divisors (see below), whose sum is σ = 31449600. Its totient is φ = 8769024.

The previous prime is 18031843. The next prime is 18031873. The reversal of 18031845 is 54813081.

It is not a de Polignac number, because 18031845 - 2¹ = 18031843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18031843) 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 31 ways as a sum of consecutive naturals, for example, 16836 + ... + 17874.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^18031845 is an apocalyptic number.

18031845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18031845 is a deficient number, since it is larger than the sum of its proper divisors (13417755).

18031845 is a wasteful number, since it uses less digits than its factorization.

18031845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 18031845 is about 4246.3919979201. The cubic root of 18031845 is about 262.2285993121.

The spelling of 18031845 in words is "eighteen million, thirty-one thousand, eight hundred forty-five".