171705138 has 32 divisors (see below), whose sum is σ = 375181632. Its totient is φ = 51955200.

The previous prime is 171705137. The next prime is 171705139. The reversal of 171705138 is 831507171.

It is an interprime number because it is at equal distance from previous prime (171705137) and next prime (171705139).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 171705099 and 171705108.

It is not an unprimeable number, because it can be changed into a prime (171705133) 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, 56670 + ... + 59622.

It is an arithmetic number, because the mean of its divisors is an integer number (11724426).

Almost surely, 2^171705138 is an apocalyptic number.

171705138 is an abundant number, since it is smaller than the sum of its proper divisors (203476494).

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

171705138 is a wasteful number, since it uses less digits than its factorization.

171705138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3850.

The product of its (nonzero) digits is 5880, while the sum is 33.

The square root of 171705138 is about 13103.6307182399. The cubic root of 171705138 is about 555.8118012009.

The spelling of 171705138 in words is "one hundred seventy-one million, seven hundred five thousand, one hundred thirty-eight".