1213312 has 16 divisors (see below), whose sum is σ = 2417400. Its totient is φ = 606592.

The previous prime is 1213301. The next prime is 1213327. The reversal of 1213312 is 2133121.

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 1213292 and 1213301.

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, 4612 + ... + 4867.

2^1213312 is an apocalyptic number.

It is an amenable number.

1213312 is a deficient number, since it is larger than the sum of its proper divisors (1204088).

1213312 is an frugal number, since it uses more digits than its factorization.

1213312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9493 (or 9481 counting only the distinct ones).

The product of its digits is 36, while the sum is 13.

The square root of 1213312 is about 1101.5044257741. The cubic root of 1213312 is about 106.6573602992.

Adding to 1213312 its reverse (2133121), we get a palindrome (3346433).

The spelling of 1213312 in words is "one million, two hundred thirteen thousand, three hundred twelve".