171975642 has 8 divisors (see below), whose sum is σ = 343951296. Its totient is φ = 57325212.

The previous prime is 171975641. The next prime is 171975647. The reversal of 171975642 is 246579171.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

171975642 is an admirable number.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 171975594 and 171975603.

It is not an unprimeable number, because it can be changed into a prime (171975641) 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 3 ways as a sum of consecutive naturals, for example, 14331298 + ... + 14331309.

It is an arithmetic number, because the mean of its divisors is an integer number (42993912).

Almost surely, 2^171975642 is an apocalyptic number.

171975642 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

171975642 is a wasteful number, since it uses less digits than its factorization.

171975642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28662612.

The product of its digits is 105840, while the sum is 42.

The square root of 171975642 is about 13113.9483756800. The cubic root of 171975642 is about 556.1035230696.

The spelling of 171975642 in words is "one hundred seventy-one million, nine hundred seventy-five thousand, six hundred forty-two".