2081816 has 32 divisors (see below), whose sum is σ = 4369680. Its totient is φ = 921600.

The previous prime is 2081813. The next prime is 2081831. The reversal of 2081816 is 6181802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2081813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3320 + ... + 3896.

2^2081816 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 2081816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2184840).

2081816 is an abundant number, since it is smaller than the sum of its proper divisors (2287864).

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

2081816 is a wasteful number, since it uses less digits than its factorization.

2081816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 2081816 is about 1442.8499575493. The cubic root of 2081816 is about 127.6872246191.

The spelling of 2081816 in words is "two million, eighty-one thousand, eight hundred sixteen".