2091636 has 48 divisors (see below), whose sum is σ = 5503680. Its totient is φ = 686880.

The previous prime is 2091631. The next prime is 2091637. The reversal of 2091636 is 6361902.

It is a happy number.

2091636 is a `hidden beast` number, since 20 + 9 + 1 + 636 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2091631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11466 + ... + 11646.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2^2091636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2751840).

2091636 is an abundant number, since it is smaller than the sum of its proper divisors (3412044).

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

2091636 is a wasteful number, since it uses less digits than its factorization.

2091636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 293 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 2091636 is about 1446.2489412269. The cubic root of 2091636 is about 127.8876781575.

The spelling of 2091636 in words is "two million, ninety-one thousand, six hundred thirty-six".