12173220 has 48 divisors (see below), whose sum is σ = 37873920. Its totient is φ = 3246048.

The previous prime is 12173219. The next prime is 12173237. The reversal of 12173220 is 2237121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12173193 and 12173202.

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, 10732 + ... + 11811.

It is an arithmetic number, because the mean of its divisors is an integer number (789040).

Almost surely, 2^12173220 is an apocalyptic number.

12173220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12173220 is an abundant number, since it is smaller than the sum of its proper divisors (25700700).

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

12173220 is a wasteful number, since it uses less digits than its factorization.

12173220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22561 (or 22553 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 12173220 is about 3489.0141874174. The cubic root of 12173220 is about 230.0391867698.

The spelling of 12173220 in words is "twelve million, one hundred seventy-three thousand, two hundred twenty".