161786 has 8 divisors (see below), whose sum is σ = 248724. Its totient is φ = 78880.

The previous prime is 161783. The next prime is 161807. The reversal of 161786 is 687161.

It can be written as a sum of positive squares in 2 ways, for example, as 133225 + 28561 = 365^2 + 169^2 .

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

Its product of digits (2016) is a multiple of the sum of its prime divisors (2016).

It is not an unprimeable number, because it can be changed into a prime (161783) 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 3 ways as a sum of consecutive naturals, for example, 905 + ... + 1068.

2¹⁶¹⁷⁸⁶ is an apocalyptic number.

161786 is a deficient number, since it is larger than the sum of its proper divisors (86938).

161786 is a wasteful number, since it uses less digits than its factorization.

161786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2016.

The product of its digits is 2016, while the sum is 29.

The square root of 161786 is about 402.2263044606. The cubic root of 161786 is about 54.4896032689.

The spelling of 161786 in words is "one hundred sixty-one thousand, seven hundred eighty-six".