12173820 has 48 divisors (see below), whose sum is σ = 34358688. Its totient is φ = 3220480.

The previous prime is 12173809. The next prime is 12173827. The reversal of 12173820 is 2837121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12173827) 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, 7480 + ... + 8960.

It is an arithmetic number, because the mean of its divisors is an integer number (715806).

Almost surely, 2^12173820 is an apocalyptic number.

12173820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12173820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17179344).

12173820 is an abundant number, since it is smaller than the sum of its proper divisors (22184868).

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

12173820 is a wasteful number, since it uses less digits than its factorization.

12173820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630 (or 1628 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 12173820 is about 3489.1001705311. The cubic root of 12173820 is about 230.0429661381.

The spelling of 12173820 in words is "twelve million, one hundred seventy-three thousand, eight hundred twenty".