1331234440 has 32 divisors (see below), whose sum is σ = 3022767000. Its totient is φ = 527606784.

The previous prime is 1331234381. The next prime is 1331234543. The reversal of 1331234440 is 444321331.

It can be written as a sum of positive squares in 4 ways, for example, as 1330936324 + 298116 = 36482^2 + 546^2 .

It is a super-2 number, since 2×1331234440² = 3544370268484227200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148305 + ... + 157024.

Almost surely, 2^1331234440 is an apocalyptic number.

1331234440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331234440 is an abundant number, since it is smaller than the sum of its proper divisors (1691532560).

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

1331234440 is a wasteful number, since it uses less digits than its factorization.

1331234440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305449 (or 305445 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1331234440 is about 36486.0855669665. The cubic root of 1331234440 is about 1100.0645802305.

Adding to 1331234440 its reverse (444321331), we get a palindrome (1775555771).

The spelling of 1331234440 in words is "one billion, three hundred thirty-one million, two hundred thirty-four thousand, four hundred forty".