312220 has 24 divisors (see below), whose sum is σ = 668304. Its totient is φ = 122496.

The previous prime is 312217. The next prime is 312229. The reversal of 312220 is 22213.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 312197 and 312206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312229) 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, 1224 + ... + 1456.

It is an arithmetic number, because the mean of its divisors is an integer number (27846).

2³¹²²²⁰ is an apocalyptic number.

It is an amenable number.

312220 is an abundant number, since it is smaller than the sum of its proper divisors (356084).

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

312220 is a wasteful number, since it uses less digits than its factorization.

312220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 312220 is about 558.7664986378. The cubic root of 312220 is about 67.8401667070.

Adding to 312220 its reverse (22213), we get a palindrome (334433).

The spelling of 312220 in words is "three hundred twelve thousand, two hundred twenty", and thus it is an iban number.