161908 has 12 divisors (see below), whose sum is σ = 300132. Its totient is φ = 76160.

The previous prime is 161881. The next prime is 161911. The reversal of 161908 is 809161.

161908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 44944 + 116964 = 212^2 + 342^2 .

It is a congruent number.

It is an unprimeable number.

161908 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1123 + ... + 1258.

It is an arithmetic number, because the mean of its divisors is an integer number (25011).

2¹⁶¹⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

161908 is a deficient number, since it is larger than the sum of its proper divisors (138224).

161908 is a wasteful number, since it uses less digits than its factorization.

161908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2402 (or 2400 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 161908 is about 402.3779318004. The cubic root of 161908 is about 54.5032963806.

The spelling of 161908 in words is "one hundred sixty-one thousand, nine hundred eight".