1331420640 has 96 divisors (see below), whose sum is σ = 4575263616. Its totient is φ = 322767360.

The previous prime is 1331420639. The next prime is 1331420669. The reversal of 1331420640 is 460241331.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1331420640.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 120802 + ... + 131361.

It is an arithmetic number, because the mean of its divisors is an integer number (47658996).

Almost surely, 2^1331420640 is an apocalyptic number.

1331420640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331420640 is an abundant number, since it is smaller than the sum of its proper divisors (3243842976).

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

1331420640 is a wasteful number, since it uses less digits than its factorization.

1331420640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 252192 (or 252184 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 1331420640 is about 36488.6371354152. The cubic root of 1331420640 is about 1100.1158665828.

Adding to 1331420640 its reverse (460241331), we get a palindrome (1791661971).

The spelling of 1331420640 in words is "one billion, three hundred thirty-one million, four hundred twenty thousand, six hundred forty".