18842473 has 8 divisors (see below), whose sum is σ = 20625416. Its totient is φ = 17107200.

The previous prime is 18842437. The next prime is 18842491. The reversal of 18842473 is 37424881.

It can be written as a sum of positive squares in 4 ways, for example, as 110889 + 18731584 = 333^2 + 4328^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18842473 - 2⁹ = 18841961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18842413) by changing a digit.

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, 11088 + ... + 12673.

It is an arithmetic number, because the mean of its divisors is an integer number (2578177).

Almost surely, 2^18842473 is an apocalyptic number.

18842473 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18842473 is a deficient number, since it is larger than the sum of its proper divisors (1782943).

18842473 is a wasteful number, since it uses less digits than its factorization.

18842473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23835.

The product of its digits is 43008, while the sum is 37.

The square root of 18842473 is about 4340.7917480570. The cubic root of 18842473 is about 266.1006694922.

The spelling of 18842473 in words is "eighteen million, eight hundred forty-two thousand, four hundred seventy-three".