18418473 has 12 divisors (see below), whose sum is σ = 26797680. Its totient is φ = 12189816.

The previous prime is 18418459. The next prime is 18418487. The reversal of 18418473 is 37481481.

18418473 is a `hidden beast` number, since 184 + 1 + 8 + 473 = 666.

It is an interprime number because it is at equal distance from previous prime (18418459) and next prime (18418487).

It is not a de Polignac number, because 18418473 - 2⁵ = 18418441 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18418403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6111 + ... + 8612.

It is an arithmetic number, because the mean of its divisors is an integer number (2233140).

Almost surely, 2^18418473 is an apocalyptic number.

It is an amenable number.

18418473 is a deficient number, since it is larger than the sum of its proper divisors (8379207).

18418473 is a wasteful number, since it uses less digits than its factorization.

18418473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14868 (or 14865 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 18418473 is about 4291.6748478886. The cubic root of 18418473 is about 264.0895443492.

The spelling of 18418473 in words is "eighteen million, four hundred eighteen thousand, four hundred seventy-three".