12197820 has 48 divisors (see below), whose sum is σ = 35642880. Its totient is φ = 3110976.

The previous prime is 12197749. The next prime is 12197821. The reversal of 12197820 is 2879121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12197821) 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, 3040 + ... + 5799.

It is an arithmetic number, because the mean of its divisors is an integer number (742560).

Almost surely, 2^12197820 is an apocalyptic number.

12197820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12197820 is an abundant number, since it is smaller than the sum of its proper divisors (23445060).

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

12197820 is a wasteful number, since it uses less digits than its factorization.

12197820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8874 (or 8872 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 12197820 is about 3492.5377592805. The cubic root of 12197820 is about 230.1940391517.

The spelling of 12197820 in words is "twelve million, one hundred ninety-seven thousand, eight hundred twenty".