1311403212 has 144 divisors (see below), whose sum is σ = 3893041152. Its totient is φ = 364452480.

The previous prime is 1311403201. The next prime is 1311403217. The reversal of 1311403212 is 2123041131.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1311403217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3114762 + ... + 3115182.

It is an arithmetic number, because the mean of its divisors is an integer number (27035008).

Almost surely, 2^1311403212 is an apocalyptic number.

1311403212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1311403212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1946520576).

1311403212 is an abundant number, since it is smaller than the sum of its proper divisors (2581637940).

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

1311403212 is a wasteful number, since it uses less digits than its factorization.

1311403212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 748 (or 743 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1311403212 is about 36213.3015893332. The cubic root of 1311403212 is about 1094.5747219469.

Adding to 1311403212 its reverse (2123041131), we get a palindrome (3434444343).

The spelling of 1311403212 in words is "one billion, three hundred eleven million, four hundred three thousand, two hundred twelve".