312223220 has 12 divisors (see below), whose sum is σ = 655668804. Its totient is φ = 124889280.

The previous prime is 312223211. The next prime is 312223237. The reversal of 312223220 is 22322213.

It can be written as a sum of positive squares in 2 ways, for example, as 99880036 + 212343184 = 9994^2 + 14572^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7805561 + ... + 7805600.

It is an arithmetic number, because the mean of its divisors is an integer number (54639067).

Almost surely, 2^312223220 is an apocalyptic number.

It is an amenable number.

312223220 is an abundant number, since it is smaller than the sum of its proper divisors (343445584).

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

312223220 is a wasteful number, since it uses less digits than its factorization.

312223220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15611170 (or 15611168 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 312223220 is about 17669.8392748774. The cubic root of 312223220 is about 678.4039992357.

Adding to 312223220 its reverse (22322213), we get a palindrome (334545433).

The spelling of 312223220 in words is "three hundred twelve million, two hundred twenty-three thousand, two hundred twenty".