161838504 has 96 divisors (see below), whose sum is σ = 488592000. Its totient is φ = 48093696.

The previous prime is 161838497. The next prime is 161838517. The reversal of 161838504 is 405838161.

161838504 is a `hidden beast` number, since 1 + 618 + 38 + 5 + 0 + 4 = 666.

161838504 is digitally balanced in base 2, 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 (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19777 + ... + 26735.

It is an arithmetic number, because the mean of its divisors is an integer number (5089500).

Almost surely, 2^161838504 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 161838504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244296000).

161838504 is an abundant number, since it is smaller than the sum of its proper divisors (326753496).

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

161838504 is a wasteful number, since it uses less digits than its factorization.

161838504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7007 (or 7000 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 161838504 is about 12721.5763174223. The cubic root of 161838504 is about 544.9549708890.

The spelling of 161838504 in words is "one hundred sixty-one million, eight hundred thirty-eight thousand, five hundred four".