1081636 has 12 divisors (see below), whose sum is σ = 1910412. Its totient is φ = 535808.

The previous prime is 1081631. The next prime is 1081637. The reversal of 1081636 is 6361801.

It can be written as a sum of positive squares in 2 ways, for example, as 20736 + 1060900 = 144^2 + 1030^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1081636.

It is not an unprimeable number, because it can be changed into a prime (1081631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 745 + ... + 1648.

It is an arithmetic number, because the mean of its divisors is an integer number (159201).

2^1081636 is an apocalyptic number.

It is an amenable number.

1081636 is a deficient number, since it is larger than the sum of its proper divisors (828776).

1081636 is a wasteful number, since it uses less digits than its factorization.

1081636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510 (or 2508 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1081636 is about 1040.0173075483. The cubic root of 1081636 is about 102.6503366017.

It can be divided in two parts, 10816 and 36, that multiplied together give a square (389376 = 624²).

The spelling of 1081636 in words is "one million, eighty-one thousand, six hundred thirty-six".