2091810 has 48 divisors (see below), whose sum is σ = 5844096. Its totient is φ = 477792.

The previous prime is 2091809. The next prime is 2091839. The reversal of 2091810 is 181902.

It is a super-2 number, since 2×2091810² = 8751338152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nialpdrome in base 8.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 759 + ... + 2181.

It is an arithmetic number, because the mean of its divisors is an integer number (121752).

2^2091810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2091810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2922048).

2091810 is an abundant number, since it is smaller than the sum of its proper divisors (3752286).

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

2091810 is a wasteful number, since it uses less digits than its factorization.

2091810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1440 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 2091810 is about 1446.3090955947. The cubic root of 2091810 is about 127.8912243193.

The spelling of 2091810 in words is "two million, ninety-one thousand, eight hundred ten".