161843688 has 48 divisors (see below), whose sum is σ = 441698400. Its totient is φ = 53532960.

The previous prime is 161843629. The next prime is 161843699. The reversal of 161843688 is 886348161.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 853 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (9202050).

Almost surely, 2^161843688 is an apocalyptic number.

161843688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161843688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220849200).

161843688 is an abundant number, since it is smaller than the sum of its proper divisors (279854712).

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

161843688 is a wasteful number, since it uses less digits than its factorization.

161843688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17302 (or 17295 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 161843688 is about 12721.7800641262. The cubic root of 161843688 is about 544.9607894805.

The spelling of 161843688 in words is "one hundred sixty-one million, eight hundred forty-three thousand, six hundred eighty-eight".