161994 has 48 divisors (see below), whose sum is σ = 410400. Its totient is φ = 42336.

The previous prime is 161983. The next prime is 161999. The reversal of 161994 is 499161.

161994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (161999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5572 + ... + 5600.

It is an arithmetic number, because the mean of its divisors is an integer number (8550).

2¹⁶¹⁹⁹⁴ is an apocalyptic number.

161994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205200).

161994 is an abundant number, since it is smaller than the sum of its proper divisors (248406).

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

161994 is a wasteful number, since it uses less digits than its factorization.

161994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67 (or 60 counting only the distinct ones).

The product of its digits is 1944, while the sum is 30.

The square root of 161994 is about 402.4847823210. The cubic root of 161994 is about 54.5129447690.

The spelling of 161994 in words is "one hundred sixty-one thousand, nine hundred ninety-four".