405221222 has 16 divisors (see below), whose sum is σ = 724868352. Its totient is φ = 166115400.

The previous prime is 405221209. The next prime is 405221233. The reversal of 405221222 is 222122504.

It is a junction number, because it is equal to n+sod(n) for n = 405221194 and 405221203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 628904 + ... + 629547.

It is an arithmetic number, because the mean of its divisors is an integer number (45304272).

Almost surely, 2^405221222 is an apocalyptic number.

405221222 is a deficient number, since it is larger than the sum of its proper divisors (319647130).

405221222 is a wasteful number, since it uses less digits than its factorization.

405221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258483.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 405221222 is about 20130.1073519244. The cubic root of 405221222 is about 739.9983089808.

Adding to 405221222 its reverse (222122504), we get a palindrome (627343726).

The spelling of 405221222 in words is "four hundred five million, two hundred twenty-one thousand, two hundred twenty-two".