404218 has 4 divisors (see below), whose sum is σ = 606330. Its totient is φ = 202108.

The previous prime is 404213. The next prime is 404221. The reversal of 404218 is 812404.

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., 332929 + 71289 = 577^2 + 267^2 .

It is a junction number, because it is equal to n+sod(n) for n = 404195 and 404204.

It is not an unprimeable number, because it can be changed into a prime (404213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101053 + ... + 101056.

2⁴⁰⁴²¹⁸ is an apocalyptic number.

404218 is a deficient number, since it is larger than the sum of its proper divisors (202112).

404218 is a wasteful number, since it uses less digits than its factorization.

404218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202111.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 404218 is about 635.7814089764. The cubic root of 404218 is about 73.9387123423.

The spelling of 404218 in words is "four hundred four thousand, two hundred eighteen".