161323404 has 192 divisors, whose sum is σ = 468840960. Its totient is φ = 42577920.

The previous prime is 161323373. The next prime is 161323427. The reversal of 161323404 is 404323161.

161323404 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2407779 + ... + 2407845.

It is an arithmetic number, because the mean of its divisors is an integer number (2441880).

Almost surely, 2^161323404 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 161323404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234420480).

161323404 is an abundant number, since it is smaller than the sum of its proper divisors (307517556).

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

161323404 is a wasteful number, since it uses less digits than its factorization.

161323404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 161323404 is about 12701.3150500253. The cubic root of 161323404 is about 544.3761950576.

Adding to 161323404 its reverse (404323161), we get a palindrome (565646565).

The spelling of 161323404 in words is "one hundred sixty-one million, three hundred twenty-three thousand, four hundred four".