1216312 has 8 divisors (see below), whose sum is σ = 2280600. Its totient is φ = 608152.

The previous prime is 1216277. The next prime is 1216337. The reversal of 1216312 is 2136121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76012 + ... + 76027.

It is an arithmetic number, because the mean of its divisors is an integer number (285075).

2^1216312 is an apocalyptic number.

It is an amenable number.

1216312 is a deficient number, since it is larger than the sum of its proper divisors (1064288).

1216312 is a wasteful number, since it uses less digits than its factorization.

1216312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152045 (or 152041 counting only the distinct ones).

The product of its digits is 72, while the sum is 16.

The square root of 1216312 is about 1102.8653589627. The cubic root of 1216312 is about 106.7451939107.

The spelling of 1216312 in words is "one million, two hundred sixteen thousand, three hundred twelve".