1213403312 has 20 divisors (see below), whose sum is σ = 2564693736. Its totient is φ = 551546880.

The previous prime is 1213403309. The next prime is 1213403357. The reversal of 1213403312 is 2133043121.

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, 3446993 + ... + 3447344.

Almost surely, 2^1213403312 is an apocalyptic number.

It is an amenable number.

1213403312 is an abundant number, since it is smaller than the sum of its proper divisors (1351290424).

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

1213403312 is a wasteful number, since it uses less digits than its factorization.

1213403312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6894356 (or 6894350 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 1213403312 is about 34833.9390824523. The cubic root of 1213403312 is about 1066.6003585517.

Adding to 1213403312 its reverse (2133043121), we get a palindrome (3346446433).

The spelling of 1213403312 in words is "one billion, two hundred thirteen million, four hundred three thousand, three hundred twelve".