171393820 has 48 divisors (see below), whose sum is σ = 394218720. Its totient is φ = 62205696.

The previous prime is 171393809. The next prime is 171393821. The reversal of 171393820 is 28393171.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171393821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9754 + ... + 20926.

It is an arithmetic number, because the mean of its divisors is an integer number (8212890).

Almost surely, 2^171393820 is an apocalyptic number.

171393820 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 171393820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197109360).

171393820 is an abundant number, since it is smaller than the sum of its proper divisors (222824900).

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

171393820 is a wasteful number, since it uses less digits than its factorization.

171393820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11254 (or 11252 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 171393820 is about 13091.7462547973. The cubic root of 171393820 is about 555.4756844880.

The spelling of 171393820 in words is "one hundred seventy-one million, three hundred ninety-three thousand, eight hundred twenty".