12173720 has 64 divisors (see below), whose sum is σ = 30270240. Its totient is φ = 4377600.

The previous prime is 12173719. The next prime is 12173723. The reversal of 12173720 is 2737121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12173723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21035 + ... + 21605.

Almost surely, 2^12173720 is an apocalyptic number.

12173720 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 12173720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15135120).

12173720 is an abundant number, since it is smaller than the sum of its proper divisors (18096520).

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

12173720 is a wasteful number, since it uses less digits than its factorization.

12173720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 12173720 is about 3489.0858401593. The cubic root of 12173720 is about 230.0423362520.

The spelling of 12173720 in words is "twelve million, one hundred seventy-three thousand, seven hundred twenty".