18828938 has 4 divisors (see below), whose sum is σ = 28243410. Its totient is φ = 9414468.

The previous prime is 18828937. The next prime is 18828941. The reversal of 18828938 is 83982881.

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., 17581249 + 1247689 = 4193^2 + 1117^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18828892 and 18828901.

It is not an unprimeable number, because it can be changed into a prime (18828937) 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 as a sum of consecutive naturals, namely, 4707233 + ... + 4707236.

Almost surely, 2^18828938 is an apocalyptic number.

18828938 is a deficient number, since it is larger than the sum of its proper divisors (9414472).

18828938 is an equidigital number, since it uses as much as digits as its factorization.

18828938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9414471.

The product of its digits is 221184, while the sum is 47.

The square root of 18828938 is about 4339.2324206016. The cubic root of 18828938 is about 266.0369387336.

The spelling of 18828938 in words is "eighteen million, eight hundred twenty-eight thousand, nine hundred thirty-eight".