1000636 has 24 divisors (see below), whose sum is σ = 2156000. Its totient is φ = 395712.

The previous prime is 1000621. The next prime is 1000639. The reversal of 1000636 is 6360001.

It is a happy number.

It is a house number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000639) 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, 1011 + ... + 1738.

2^1000636 is an apocalyptic number.

It is an amenable number.

1000636 is an abundant number, since it is smaller than the sum of its proper divisors (1155364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1000636 is a wasteful number, since it uses less digits than its factorization.

1000636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2773 (or 2771 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 1000636 is about 1000.3179494541. The cubic root of 1000636 is about 100.0211955072.

Adding to 1000636 its reverse (6360001), we get a palindrome (7360637).

The spelling of 1000636 in words is "one million, six hundred thirty-six", and thus it is an aban number.