161982 has 12 divisors (see below), whose sum is σ = 351000. Its totient is φ = 53988.

The previous prime is 161977. The next prime is 161983. The reversal of 161982 is 289161.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161983) by changing a digit.

161982 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 5 ways as a sum of consecutive naturals, for example, 4482 + ... + 4517.

It is an arithmetic number, because the mean of its divisors is an integer number (29250).

2¹⁶¹⁹⁸² is an apocalyptic number.

161982 is an abundant number, since it is smaller than the sum of its proper divisors (189018).

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

161982 is a wasteful number, since it uses less digits than its factorization.

161982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9007 (or 9004 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 161982 is about 402.4698746490. The cubic root of 161982 is about 54.5115986873.

The spelling of 161982 in words is "one hundred sixty-one thousand, nine hundred eighty-two".