1328548381 has 16 divisors (see below), whose sum is σ = 1453636800. Its totient is φ = 1209800448.

The previous prime is 1328548373. The next prime is 1328548387. The reversal of 1328548381 is 1838458231.

1328548381 = 9² + 10² + ... + 1585².

It is a cyclic number.

It is not a de Polignac number, because 1328548381 - 2³ = 1328548373 is a prime.

It is a super-2 number, since 2×1328548381² = 3530081601315442322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328548387) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 46965 + ... + 69733.

It is an arithmetic number, because the mean of its divisors is an integer number (90852300).

Almost surely, 2^1328548381 is an apocalyptic number.

It is an amenable number.

1328548381 is a deficient number, since it is larger than the sum of its proper divisors (125088419).

1328548381 is a wasteful number, since it uses less digits than its factorization.

1328548381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22908.

The product of its digits is 184320, while the sum is 43.

The square root of 1328548381 is about 36449.2576193261. The cubic root of 1328548381 is about 1099.3242077726.

The spelling of 1328548381 in words is "one billion, three hundred twenty-eight million, five hundred forty-eight thousand, three hundred eighty-one".