1365543380 has 18 divisors (see below), whose sum is σ = 2867988186. Its totient is φ = 546151248.

The previous prime is 1365543379. The next prime is 1365543401. The reversal of 1365543380 is 833455631.

It can be written as a sum of positive squares in only one way, i.e., 1092434704 + 273108676 = 33052^2 + 16526^2 .

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 161129 + ... + 169391.

It is an arithmetic number, because the mean of its divisors is an integer number (159332677).

Almost surely, 2^1365543380 is an apocalyptic number.

1365543380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1365543380 is an abundant number, since it is smaller than the sum of its proper divisors (1502444806).

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

1365543380 is an frugal number, since it uses more digits than its factorization.

1365543380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16535 (or 8270 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 1365543380 is about 36953.2593961615. The cubic root of 1365543380 is about 1109.4349259753.

The spelling of 1365543380 in words is "one billion, three hundred sixty-five million, five hundred forty-three thousand, three hundred eighty".