407801221 has 4 divisors (see below), whose sum is σ = 408798700. Its totient is φ = 406803744.

The previous prime is 407801197. The next prime is 407801243. The reversal of 407801221 is 122108704.

It is a happy number.

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 349278721 + 58522500 = 18689^2 + 7650^2 .

It is a cyclic number.

It is not a de Polignac number, because 407801221 - 2⁵ = 407801189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (407801291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498126 + ... + 498943.

It is an arithmetic number, because the mean of its divisors is an integer number (102199675).

Almost surely, 2^407801221 is an apocalyptic number.

It is an amenable number.

407801221 is a deficient number, since it is larger than the sum of its proper divisors (997479).

407801221 is an equidigital number, since it uses as much as digits as its factorization.

407801221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997478.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 407801221 is about 20194.0887637942. The cubic root of 407801221 is about 741.5654836394.

Adding to 407801221 its reverse (122108704), we get a palindrome (529909925).

The spelling of 407801221 in words is "four hundred seven million, eight hundred one thousand, two hundred twenty-one".