161847840 has 384 divisors, whose sum is σ = 661893120. Its totient is φ = 32256000.

The previous prime is 161847817. The next prime is 161847841. The reversal of 161847840 is 48748161.

It is not an unprimeable number, because it can be changed into a prime (161847841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1071765 + ... + 1071915.

It is an arithmetic number, because the mean of its divisors is an integer number (1723680).

Almost surely, 2^161847840 is an apocalyptic number.

161847840 is a gapful number since it is divisible by the number (10) 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 161847840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (330946560).

161847840 is an abundant number, since it is smaller than the sum of its proper divisors (500045280).

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

161847840 is a wasteful number, since it uses less digits than its factorization.

161847840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 161847840 is about 12721.9432477904. The cubic root of 161847840 is about 544.9654496516.

The spelling of 161847840 in words is "one hundred sixty-one million, eight hundred forty-seven thousand, eight hundred forty".