18724473 has 16 divisors (see below), whose sum is σ = 28013440. Its totient is φ = 12359952.

The previous prime is 18724457. The next prime is 18724477. The reversal of 18724473 is 37442781.

It is a happy number.

18724473 is a `hidden beast` number, since 187 + 2 + 4 + 473 = 666.

It is not a de Polignac number, because 18724473 - 2⁴ = 18724457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18724477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 586 + ... + 6147.

It is an arithmetic number, because the mean of its divisors is an integer number (1750840).

Almost surely, 2^18724473 is an apocalyptic number.

It is an amenable number.

18724473 is a deficient number, since it is larger than the sum of its proper divisors (9288967).

18724473 is a wasteful number, since it uses less digits than its factorization.

18724473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6845 (or 6839 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 18724473 is about 4327.1784109278. The cubic root of 18724473 is about 265.5440253846.

The spelling of 18724473 in words is "eighteen million, seven hundred twenty-four thousand, four hundred seventy-three".