1305403212 has 12 divisors (see below), whose sum is σ = 3045940856. Its totient is φ = 435134400.

The previous prime is 1305403207. The next prime is 1305403213. The reversal of 1305403212 is 2123045031.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1305403213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54391789 + ... + 54391812.

Almost surely, 2^1305403212 is an apocalyptic number.

1305403212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1305403212 is an abundant number, since it is smaller than the sum of its proper divisors (1740537644).

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

1305403212 is a wasteful number, since it uses less digits than its factorization.

1305403212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108783608 (or 108783606 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1305403212 is about 36130.3641276974. The cubic root of 1305403212 is about 1092.9028512570.

Adding to 1305403212 its reverse (2123045031), we get a palindrome (3428448243).

The spelling of 1305403212 in words is "one billion, three hundred five million, four hundred three thousand, two hundred twelve".