173213920 has 144 divisors (see below), whose sum is σ = 470564640. Its totient is φ = 60093440.

The previous prime is 173213893. The next prime is 173213921. The reversal of 173213920 is 29312371.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173213921) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 445086 + ... + 445474.

It is an arithmetic number, because the mean of its divisors is an integer number (3267810).

Almost surely, 2^173213920 is an apocalyptic number.

173213920 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 173213920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (235282320).

173213920 is an abundant number, since it is smaller than the sum of its proper divisors (297350720).

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

173213920 is a wasteful number, since it uses less digits than its factorization.

173213920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 430 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 173213920 is about 13161.0759438581. The cubic root of 173213920 is about 557.4350383798.

The spelling of 173213920 in words is "one hundred seventy-three million, two hundred thirteen thousand, nine hundred twenty".