161812 has 12 divisors (see below), whose sum is σ = 323680. Its totient is φ = 69336.

The previous prime is 161807. The next prime is 161831. The reversal of 161812 is 218161.

161812 is an admirable number.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 161812.

It is a congruent number.

It is an unprimeable number.

161812 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2862 + ... + 2917.

2¹⁶¹⁸¹² is an apocalyptic number.

It is an amenable number.

161812 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.

161812 is a wasteful number, since it uses less digits than its factorization.

161812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790 (or 5788 counting only the distinct ones).

The product of its digits is 96, while the sum is 19.

The square root of 161812 is about 402.2586232761. The cubic root of 161812 is about 54.4925220501.

Adding to 161812 its reverse (218161), we get a palindrome (379973).

The spelling of 161812 in words is "one hundred sixty-one thousand, eight hundred twelve".