18836842 has 4 divisors (see below), whose sum is σ = 28255266. Its totient is φ = 9418420.

The previous prime is 18836837. The next prime is 18836869. The reversal of 18836842 is 24863881.

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., 18567481 + 269361 = 4309^2 + 519^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18836795 and 18836804.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4709209 + ... + 4709212.

Almost surely, 2^18836842 is an apocalyptic number.

18836842 is a deficient number, since it is larger than the sum of its proper divisors (9418424).

18836842 is an equidigital number, since it uses as much as digits as its factorization.

18836842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9418423.

The product of its digits is 73728, while the sum is 40.

The square root of 18836842 is about 4340.1430851989. The cubic root of 18836842 is about 266.0741591334.

It can be divided in two parts, 188 and 36842, that multiplied together give a palindrome (6926296).

The spelling of 18836842 in words is "eighteen million, eight hundred thirty-six thousand, eight hundred forty-two".