1641218 has 4 divisors (see below), whose sum is σ = 2461830. Its totient is φ = 820608.

The previous prime is 1641217. The next prime is 1641229. The reversal of 1641218 is 8121461.

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., 1006009 + 635209 = 1003^2 + 797^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1641193 and 1641202.

It is not an unprimeable number, because it can be changed into a prime (1641217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410303 + ... + 410306.

2^1641218 is an apocalyptic number.

1641218 is a deficient number, since it is larger than the sum of its proper divisors (820612).

1641218 is an equidigital number, since it uses as much as digits as its factorization.

1641218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820611.

The product of its digits is 384, while the sum is 23.

The square root of 1641218 is about 1281.1003083287. The cubic root of 1641218 is about 117.9565577900.

Adding to 1641218 its reverse (8121461), we get a palindrome (9762679).

The spelling of 1641218 in words is "one million, six hundred forty-one thousand, two hundred eighteen".