161304 has 64 divisors (see below), whose sum is σ = 483840. Its totient is φ = 44160.

The previous prime is 161303. The next prime is 161309. The reversal of 161304 is 403161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161303) 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, 3409 + ... + 3455.

It is an arithmetic number, because the mean of its divisors is an integer number (7560).

2¹⁶¹³⁰⁴ 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 161304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241920).

161304 is an abundant number, since it is smaller than the sum of its proper divisors (322536).

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

161304 is a wasteful number, since it uses less digits than its factorization.

161304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 161304 is about 401.6266923400. The cubic root of 161304 is about 54.4354368303.

Adding to 161304 its reverse (403161), we get a palindrome (564465).

It can be divided in two parts, 161 and 304, that added together give a triangular number (465 = T₃₀).

The spelling of 161304 in words is "one hundred sixty-one thousand, three hundred four".