2197820 has 12 divisors (see below), whose sum is σ = 4615464. Its totient is φ = 879120.

The previous prime is 2197799. The next prime is 2197847. The reversal of 2197820 is 287912.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54926 + ... + 54965.

It is an arithmetic number, because the mean of its divisors is an integer number (384622).

2^2197820 is an apocalyptic number.

2197820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2197820 is an abundant number, since it is smaller than the sum of its proper divisors (2417644).

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

2197820 is a wasteful number, since it uses less digits than its factorization.

2197820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109900 (or 109898 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 2197820 is about 1482.5046374295. The cubic root of 2197820 is about 130.0161715582.

The spelling of 2197820 in words is "two million, one hundred ninety-seven thousand, eight hundred twenty".