161741440 has 128 divisors (see below), whose sum is σ = 448473600. Its totient is φ = 54632448.

The previous prime is 161741431. The next prime is 161741443. The reversal of 161741440 is 44147161.

161741440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a junction number, because it is equal to n+sod(n) for n = 161741399 and 161741408.

It is not an unprimeable number, because it can be changed into a prime (161741443) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 353692 + ... + 354148.

It is an arithmetic number, because the mean of its divisors is an integer number (3503700).

Almost surely, 2^161741440 is an apocalyptic number.

161741440 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 161741440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (224236800).

161741440 is an abundant number, since it is smaller than the sum of its proper divisors (286732160).

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

161741440 is an equidigital number, since it uses as much as digits as its factorization.

161741440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 562 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 161741440 is about 12717.7608091991. The cubic root of 161741440 is about 544.8460019965.

The spelling of 161741440 in words is "one hundred sixty-one million, seven hundred forty-one thousand, four hundred forty".