1381005 has 12 divisors (see below), whose sum is σ = 2393820. Its totient is φ = 736512.

The previous prime is 1380997. The next prime is 1381027. The reversal of 1381005 is 5001831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1052676 + 328329 = 1026^2 + 573^2 .

It is not a de Polignac number, because 1381005 - 2³ = 1380997 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15300 + ... + 15389.

It is an arithmetic number, because the mean of its divisors is an integer number (199485).

2^1381005 is an apocalyptic number.

1381005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1381005 is a deficient number, since it is larger than the sum of its proper divisors (1012815).

1381005 is a wasteful number, since it uses less digits than its factorization.

1381005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30700 (or 30697 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 1381005 is about 1175.1616910026. The cubic root of 1381005 is about 111.3606482355.

Adding to 1381005 its reverse (5001831), we get a palindrome (6382836).

It can be divided in two parts, 13 and 81005, that added together give a palindrome (81018).

The spelling of 1381005 in words is "one million, three hundred eighty-one thousand, five".