171305442 has 160 divisors (see below), whose sum is σ = 495120384. Its totient is φ = 42962400.

The previous prime is 171305441. The next prime is 171305461. The reversal of 171305442 is 244503171.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (171305441) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 386473 + ... + 386915.

Almost surely, 2^171305442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 171305442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247560192).

171305442 is an abundant number, since it is smaller than the sum of its proper divisors (323814942).

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

171305442 is a wasteful number, since it uses less digits than its factorization.

171305442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506 (or 497 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 171305442 is about 13088.3704868100. The cubic root of 171305442 is about 555.3801923822.

The spelling of 171305442 in words is "one hundred seventy-one million, three hundred five thousand, four hundred forty-two".