400313221 has 8 divisors (see below), whose sum is σ = 499091904. Its totient is φ = 311932320.

The previous prime is 400313203. The next prime is 400313237. The reversal of 400313221 is 122313004.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-400313221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400313195 and 400313204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400313281) 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, 2599360 + ... + 2599513.

It is an arithmetic number, because the mean of its divisors is an integer number (62386488).

Almost surely, 2^400313221 is an apocalyptic number.

It is an amenable number.

400313221 is a deficient number, since it is larger than the sum of its proper divisors (98778683).

400313221 is a wasteful number, since it uses less digits than its factorization.

400313221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5198891.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 400313221 is about 20007.8289926718. The cubic root of 400313221 is about 736.9985688895.

Adding to 400313221 its reverse (122313004), we get a palindrome (522626225).

The spelling of 400313221 in words is "four hundred million, three hundred thirteen thousand, two hundred twenty-one".