161740 has 12 divisors (see below), whose sum is σ = 339696. Its totient is φ = 64688.

The previous prime is 161731. The next prime is 161741. The reversal of 161740 is 47161.

It is a happy number.

It is a plaindrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (161741) 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 3 ways as a sum of consecutive naturals, for example, 4024 + ... + 4063.

It is an arithmetic number, because the mean of its divisors is an integer number (28308).

2¹⁶¹⁷⁴⁰ is an apocalyptic number.

161740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161740 is an abundant number, since it is smaller than the sum of its proper divisors (177956).

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

161740 is a wasteful number, since it uses less digits than its factorization.

161740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8096 (or 8094 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 161740 is about 402.1691186553. The cubic root of 161740 is about 54.4844385052.

The spelling of 161740 in words is "one hundred sixty-one thousand, seven hundred forty".