1383581 has 4 divisors (see below), whose sum is σ = 1389564. Its totient is φ = 1377600.

The previous prime is 1383553. The next prime is 1383583. The reversal of 1383581 is 1853831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 872356 + 511225 = 934^2 + 715^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383581 - 2⁶ = 1383517 is a prime.

It is a super-2 number, since 2×1383581² = 3828592767122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1383583) 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 3 ways as a sum of consecutive naturals, for example, 2630 + ... + 3111.

It is an arithmetic number, because the mean of its divisors is an integer number (347391).

2^1383581 is an apocalyptic number.

It is an amenable number.

1383581 is a deficient number, since it is larger than the sum of its proper divisors (5983).

1383581 is an equidigital number, since it uses as much as digits as its factorization.

1383581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5982.

The product of its digits is 2880, while the sum is 29.

The square root of 1383581 is about 1176.2571997654. The cubic root of 1383581 is about 111.4298458732.

The spelling of 1383581 in words is "one million, three hundred eighty-three thousand, five hundred eighty-one".