404412221 has 8 divisors (see below), whose sum is σ = 418825080. Its totient is φ = 390030592.

The previous prime is 404412209. The next prime is 404412223. The reversal of 404412221 is 122214404.

It can be written as a sum of positive squares in 4 ways, for example, as 121 + 404412100 = 11^2 + 20110^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 404412221 - 2⁶ = 404412157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 404412193 and 404412202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (404412223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20321 + ... + 34953.

It is an arithmetic number, because the mean of its divisors is an integer number (52353135).

Almost surely, 2^404412221 is an apocalyptic number.

It is an amenable number.

404412221 is a deficient number, since it is larger than the sum of its proper divisors (14412859).

404412221 is a wasteful number, since it uses less digits than its factorization.

404412221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15615.

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 404412221 is about 20110.0030084533. The cubic root of 404412221 is about 739.5055261268.

Adding to 404412221 its reverse (122214404), we get a palindrome (526626625).

The spelling of 404412221 in words is "four hundred four million, four hundred twelve thousand, two hundred twenty-one".