400222813 has 4 divisors (see below), whose sum is σ = 408738240. Its totient is φ = 391707388.

The previous prime is 400222807. The next prime is 400222829. The reversal of 400222813 is 318222004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 400222813 - 2²⁵ = 366668381 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 (400222843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4257643 + ... + 4257736.

It is an arithmetic number, because the mean of its divisors is an integer number (102184560).

Almost surely, 2^400222813 is an apocalyptic number.

It is an amenable number.

400222813 is a deficient number, since it is larger than the sum of its proper divisors (8515427).

400222813 is an equidigital number, since it uses as much as digits as its factorization.

400222813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8515426.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 400222813 is about 20005.5695495030. The cubic root of 400222813 is about 736.9430826854.

Adding to 400222813 its reverse (318222004), we get a palindrome (718444817).

The spelling of 400222813 in words is "four hundred million, two hundred twenty-two thousand, eight hundred thirteen".