312009222 has 32 divisors (see below), whose sum is σ = 750700800. Its totient is φ = 84453408.

The previous prime is 312009209. The next prime is 312009223. The reversal of 312009222 is 222900213.

It is a super-2 number, since 2×312009222² = 194699509226090568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312009223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194697 + ... + 196292.

It is an arithmetic number, because the mean of its divisors is an integer number (23459400).

Almost surely, 2^312009222 is an apocalyptic number.

312009222 is an abundant number, since it is smaller than the sum of its proper divisors (438691578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

312009222 is a wasteful number, since it uses less digits than its factorization.

312009222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391020.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 312009222 is about 17663.7827771970. The cubic root of 312009222 is about 678.2489709626.

Adding to 312009222 its reverse (222900213), we get a palindrome (534909435).

The spelling of 312009222 in words is "three hundred twelve million, nine thousand, two hundred twenty-two".