18040305 has 16 divisors (see below), whose sum is σ = 28917504. Its totient is φ = 9603840.

The previous prime is 18040277. The next prime is 18040327. The reversal of 18040305 is 50304081.

It is not a de Polignac number, because 18040305 - 2⁵ = 18040273 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14040 + ... + 15270.

It is an arithmetic number, because the mean of its divisors is an integer number (1807344).

Almost surely, 2^18040305 is an apocalyptic number.

18040305 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18040305 is a deficient number, since it is larger than the sum of its proper divisors (10877199).

18040305 is a wasteful number, since it uses less digits than its factorization.

18040305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2216.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 18040305 is about 4247.3880208900. The cubic root of 18040305 is about 262.2696028274.

Adding to 18040305 its reverse (50304081), we get a palindrome (68344386).

The spelling of 18040305 in words is "eighteen million, forty thousand, three hundred five".