1328381 has 8 divisors (see below), whose sum is σ = 1392384. Its totient is φ = 1265760.

The previous prime is 1328357. The next prime is 1328387. The reversal of 1328381 is 1838231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1328381 - 2⁶ = 1328317 is a prime.

It is a super-2 number, since 2×1328381² = 3529192162322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1328381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1970 + ... + 2556.

It is an arithmetic number, because the mean of its divisors is an integer number (174048).

2^1328381 is an apocalyptic number.

It is an amenable number.

1328381 is a deficient number, since it is larger than the sum of its proper divisors (64003).

1328381 is an equidigital number, since it uses as much as digits as its factorization.

1328381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691.

The product of its digits is 1152, while the sum is 26.

The square root of 1328381 is about 1152.5541202043. The cubic root of 1328381 is about 109.9278038657.

The spelling of 1328381 in words is "one million, three hundred twenty-eight thousand, three hundred eighty-one".