1381636 has 12 divisors (see below), whose sum is σ = 2445660. Its totient is φ = 682880.

The previous prime is 1381621. The next prime is 1381637. The reversal of 1381636 is 6361831.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 828100 = 744^2 + 910^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1381637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1585 + ... + 2296.

It is an arithmetic number, because the mean of its divisors is an integer number (203805).

2^1381636 is an apocalyptic number.

It is an amenable number.

1381636 is a deficient number, since it is larger than the sum of its proper divisors (1064024).

1381636 is a wasteful number, since it uses less digits than its factorization.

1381636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974 (or 3972 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The square root of 1381636 is about 1175.4301340360. The cubic root of 1381636 is about 111.3776063855.

The spelling of 1381636 in words is "one million, three hundred eighty-one thousand, six hundred thirty-six".