18837842 has 4 divisors (see below), whose sum is σ = 28256766. Its totient is φ = 9418920.

The previous prime is 18837811. The next prime is 18837857. The reversal of 18837842 is 24873881.

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., 16248961 + 2588881 = 4031^2 + 1609^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18837842.

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 as a sum of consecutive naturals, namely, 4709459 + ... + 4709462.

Almost surely, 2^18837842 is an apocalyptic number.

18837842 is a deficient number, since it is larger than the sum of its proper divisors (9418924).

18837842 is an equidigital number, since it uses as much as digits as its factorization.

18837842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9418923.

The product of its digits is 86016, while the sum is 41.

The square root of 18837842 is about 4340.2582872451. The cubic root of 18837842 is about 266.0788674501.

The spelling of 18837842 in words is "eighteen million, eight hundred thirty-seven thousand, eight hundred forty-two".