1320543440 has 40 divisors (see below), whose sum is σ = 3086373888. Its totient is φ = 525445760.

The previous prime is 1320543409. The next prime is 1320543467. The reversal of 1320543440 is 443450231.

It is a tau number, because it is divible by the number of its divisors (40).

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, 27932 + ... + 58491.

Almost surely, 2^1320543440 is an apocalyptic number.

1320543440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320543440 is an abundant number, since it is smaller than the sum of its proper divisors (1765830448).

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

1320543440 is a wasteful number, since it uses less digits than its factorization.

1320543440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86627 (or 86621 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 1320543440 is about 36339.2823264302. The cubic root of 1320543440 is about 1097.1118283816. Note that the first 3 decimals are identical.

Adding to 1320543440 its reverse (443450231), we get a palindrome (1763993671).

The spelling of 1320543440 in words is "one billion, three hundred twenty million, five hundred forty-three thousand, four hundred forty".