1228312 has 16 divisors (see below), whose sum is σ = 2424600. Its totient is φ = 581760.

The previous prime is 1228309. The next prime is 1228327. The reversal of 1228312 is 2138221.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a self number, because there is not a number n which added to its sum of digits gives 1228312.

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, 3889 + ... + 4192.

2^1228312 is an apocalyptic number.

It is an amenable number.

1228312 is a deficient number, since it is larger than the sum of its proper divisors (1196288).

1228312 is a wasteful number, since it uses less digits than its factorization.

1228312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8106 (or 8102 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 1228312 is about 1108.2923801958. The cubic root of 1228312 is about 107.0950911740.

Subtracting 1228312 from its reverse (2138221), we obtain a palindrome (909909).

It can be divided in two parts, 1228 and 312, that added together give a triangular number (1540 = T₅₅).

The spelling of 1228312 in words is "one million, two hundred twenty-eight thousand, three hundred twelve".