18744842 has 4 divisors (see below), whose sum is σ = 28117266. Its totient is φ = 9372420.

The previous prime is 18744841. The next prime is 18744851. The reversal of 18744842 is 24844781.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11621281 + 7123561 = 3409^2 + 2669^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18744796 and 18744805.

It is not an unprimeable number, because it can be changed into a prime (18744841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4686209 + ... + 4686212.

Almost surely, 2^18744842 is an apocalyptic number.

18744842 is a deficient number, since it is larger than the sum of its proper divisors (9372424).

18744842 is an equidigital number, since it uses as much as digits as its factorization.

18744842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9372423.

The product of its digits is 57344, while the sum is 38.

The square root of 18744842 is about 4329.5313834178. The cubic root of 18744842 is about 265.6402792041.

The spelling of 18744842 in words is "eighteen million, seven hundred forty-four thousand, eight hundred forty-two".