18505473 has 16 divisors (see below), whose sum is σ = 28887936. Its totient is φ = 10316160.

The previous prime is 18505463. The next prime is 18505483. The reversal of 18505473 is 37450581.

It is an interprime number because it is at equal distance from previous prime (18505463) and next prime (18505483).

It is not a de Polignac number, because 18505473 - 2⁴ = 18505457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18505423) 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, 9886 + ... + 11607.

It is an arithmetic number, because the mean of its divisors is an integer number (1805496).

Almost surely, 2^18505473 is an apocalyptic number.

It is an amenable number.

18505473 is a deficient number, since it is larger than the sum of its proper divisors (10382463).

18505473 is a wasteful number, since it uses less digits than its factorization.

18505473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21544.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 18505473 is about 4301.7988098004. The cubic root of 18505473 is about 264.5047019913.

The spelling of 18505473 in words is "eighteen million, five hundred five thousand, four hundred seventy-three".