18056505 has 16 divisors (see below), whose sum is σ = 28952064. Its totient is φ = 9609600.

The previous prime is 18056503. The next prime is 18056543. The reversal of 18056505 is 50565081.

It is a happy number.

It is not a de Polignac number, because 18056505 - 2¹ = 18056503 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18056503) 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 15 ways as a sum of consecutive naturals, for example, 8280 + ... + 10230.

It is an arithmetic number, because the mean of its divisors is an integer number (1809504).

Almost surely, 2^18056505 is an apocalyptic number.

18056505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18056505 is a deficient number, since it is larger than the sum of its proper divisors (10895559).

18056505 is a wasteful number, since it uses less digits than its factorization.

18056505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576.

The product of its (nonzero) digits is 6000, while the sum is 30.

The square root of 18056505 is about 4249.2946473503. The cubic root of 18056505 is about 262.3480844351.

The spelling of 18056505 in words is "eighteen million, fifty-six thousand, five hundred five".