18821041 has 4 divisors (see below), whose sum is σ = 18902052. Its totient is φ = 18740032.

The previous prime is 18821027. The next prime is 18821051. The reversal of 18821041 is 14012881.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12988816 + 5832225 = 3604^2 + 2415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18821041 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18820997 and 18821015.

It is not an unprimeable number, because it can be changed into a prime (18821021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40156 + ... + 40621.

It is an arithmetic number, because the mean of its divisors is an integer number (4725513).

Almost surely, 2^18821041 is an apocalyptic number.

It is an amenable number.

18821041 is a deficient number, since it is larger than the sum of its proper divisors (81011).

18821041 is an equidigital number, since it uses as much as digits as its factorization.

18821041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81010.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 18821041 is about 4338.3223716086. The cubic root of 18821041 is about 265.9997408933. Note that the first 3 decimals are identical.

The spelling of 18821041 in words is "eighteen million, eight hundred twenty-one thousand, forty-one".