161800408 has 128 divisors (see below), whose sum is σ = 402739200. Its totient is φ = 59097600.

The previous prime is 161800403. The next prime is 161800433. The reversal of 161800408 is 804008161.

161800408 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161800403) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 706438 + ... + 706666.

It is an arithmetic number, because the mean of its divisors is an integer number (3146400).

Almost surely, 2^161800408 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 161800408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (201369600).

161800408 is an abundant number, since it is smaller than the sum of its proper divisors (240938792).

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

161800408 is a wasteful number, since it uses less digits than its factorization.

161800408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321 (or 317 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 28.

The square root of 161800408 is about 12720.0789305727. The cubic root of 161800408 is about 544.9122076132.

Adding to 161800408 its reverse (804008161), we get a palindrome (965808569).

The spelling of 161800408 in words is "one hundred sixty-one million, eight hundred thousand, four hundred eight".