1331423440 has 20 divisors (see below), whose sum is σ = 3095559684. Its totient is φ = 532569344.

The previous prime is 1331423417. The next prime is 1331423479. The reversal of 1331423440 is 443241331.

It can be written as a sum of positive squares in 2 ways, for example, as 142277184 + 1189146256 = 11928^2 + 34484^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8321317 + ... + 8321476.

Almost surely, 2^1331423440 is an apocalyptic number.

1331423440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331423440 is an abundant number, since it is smaller than the sum of its proper divisors (1764136244).

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

1331423440 is a wasteful number, since it uses less digits than its factorization.

1331423440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16642806 (or 16642800 counting only the distinct ones).

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

The square root of 1331423440 is about 36488.6755035038. The cubic root of 1331423440 is about 1100.1166377697.

Adding to 1331423440 its reverse (443241331), we get a palindrome (1774664771).

The spelling of 1331423440 in words is "one billion, three hundred thirty-one million, four hundred twenty-three thousand, four hundred forty".