312135222 has 16 divisors (see below), whose sum is σ = 713452032. Its totient is φ = 89181480.

The previous prime is 312135221. The next prime is 312135227. The reversal of 312135222 is 222531213.

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 (312135221) 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, 3715854 + ... + 3715937.

It is an arithmetic number, because the mean of its divisors is an integer number (44590752).

Almost surely, 2^312135222 is an apocalyptic number.

312135222 is an abundant number, since it is smaller than the sum of its proper divisors (401316810).

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

312135222 is a wasteful number, since it uses less digits than its factorization.

312135222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7431803.

The product of its digits is 720, while the sum is 21.

The square root of 312135222 is about 17667.3490371363. The cubic root of 312135222 is about 678.3402587228.

Adding to 312135222 its reverse (222531213), we get a palindrome (534666435).

The spelling of 312135222 in words is "three hundred twelve million, one hundred thirty-five thousand, two hundred twenty-two".