1331212440 has 32 divisors (see below), whose sum is σ = 3993637680. Its totient is φ = 354989952.

The previous prime is 1331212411. The next prime is 1331212453. The reversal of 1331212440 is 442121331.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5546599 + ... + 5546838.

Almost surely, 2^1331212440 is an apocalyptic number.

1331212440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331212440 is an abundant number, since it is smaller than the sum of its proper divisors (2662425240).

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

1331212440 is a wasteful number, since it uses less digits than its factorization.

1331212440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11093451 (or 11093447 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 1331212440 is about 36485.7840809266. The cubic root of 1331212440 is about 1100.0585203026.

Adding to 1331212440 its reverse (442121331), we get a palindrome (1773333771).

It can be divided in two parts, 13312 and 12440, that added together give a palindrome (25752).

The spelling of 1331212440 in words is "one billion, three hundred thirty-one million, two hundred twelve thousand, four hundred forty".