1091636 has 24 divisors (see below), whose sum is σ = 2352000. Its totient is φ = 431712.

The previous prime is 1091633. The next prime is 1091639. The reversal of 1091636 is 6361901.

It is an interprime number because it is at equal distance from previous prime (1091633) and next prime (1091639).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091633) 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 7 ways as a sum of consecutive naturals, for example, 1136 + ... + 1863.

It is an arithmetic number, because the mean of its divisors is an integer number (98000).

2^1091636 is an apocalyptic number.

It is an amenable number.

1091636 is an abundant number, since it is smaller than the sum of its proper divisors (1260364).

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

1091636 is a wasteful number, since it uses less digits than its factorization.

1091636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3023 (or 3021 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 1091636 is about 1044.8138590199. The cubic root of 1091636 is about 102.9657095141.

The spelling of 1091636 in words is "one million, ninety-one thousand, six hundred thirty-six".