18474945 has 8 divisors (see below), whose sum is σ = 29559936. Its totient is φ = 9853296.

The previous prime is 18474931. The next prime is 18474991. The reversal of 18474945 is 54947481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18474945 - 2¹⁶ = 18409409 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18474897 and 18474906.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 615817 + ... + 615846.

It is an arithmetic number, because the mean of its divisors is an integer number (3694992).

Almost surely, 2^18474945 is an apocalyptic number.

18474945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18474945 is a deficient number, since it is larger than the sum of its proper divisors (11084991).

18474945 is a wasteful number, since it uses less digits than its factorization.

18474945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1231671.

The product of its digits is 161280, while the sum is 42.

The square root of 18474945 is about 4298.2490621182. The cubic root of 18474945 is about 264.3591730825.

The spelling of 18474945 in words is "eighteen million, four hundred seventy-four thousand, nine hundred forty-five".