2197806 has 32 divisors (see below), whose sum is σ = 4986240. Its totient is φ = 640224.

The previous prime is 2197799. The next prime is 2197847. The reversal of 2197806 is 6087912.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 741 + ... + 2223.

It is an arithmetic number, because the mean of its divisors is an integer number (155820).

2^2197806 is an apocalyptic number.

2197806 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a pronic number, being equal to 1482×1483.

It is a practical number, because each smaller number is the sum of distinct divisors of 2197806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2493120).

2197806 is an abundant number, since it is smaller than the sum of its proper divisors (2788434).

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

2197806 is a wasteful number, since it uses less digits than its factorization.

2197806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 2197806 is about 1482.4999156830. The cubic root of 2197806 is about 130.0158954922.

It can be divided in two parts, 2197 and 806, that added together give a palindrome (3003).

The spelling of 2197806 in words is "two million, one hundred ninety-seven thousand, eight hundred six".