404621218 has 4 divisors (see below), whose sum is σ = 606931830. Its totient is φ = 202310608.

The previous prime is 404621213. The next prime is 404621227. The reversal of 404621218 is 812126404.

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., 320660649 + 83960569 = 17907^2 + 9163^2 .

It is not an unprimeable number, because it can be changed into a prime (404621213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101155303 + ... + 101155306.

Almost surely, 2^404621218 is an apocalyptic number.

404621218 is a deficient number, since it is larger than the sum of its proper divisors (202310612).

404621218 is a wasteful number, since it uses less digits than its factorization.

404621218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202310611.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 404621218 is about 20115.1986815940. The cubic root of 404621218 is about 739.6328943680.

The spelling of 404621218 in words is "four hundred four million, six hundred twenty-one thousand, two hundred eighteen".