161868 has 48 divisors (see below), whose sum is σ = 451584. Its totient is φ = 44160.

The previous prime is 161839. The next prime is 161869. The reversal of 161868 is 868161.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3421 + ... + 3467.

It is an arithmetic number, because the mean of its divisors is an integer number (9408).

2¹⁶¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225792).

161868 is an abundant number, since it is smaller than the sum of its proper divisors (289716).

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

161868 is a wasteful number, since it uses less digits than its factorization.

161868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102 (or 100 counting only the distinct ones).

The product of its digits is 2304, while the sum is 30.

The square root of 161868 is about 402.3282242150. The cubic root of 161868 is about 54.4988075939.

The spelling of 161868 in words is "one hundred sixty-one thousand, eight hundred sixty-eight".