161870 has 8 divisors (see below), whose sum is σ = 291384. Its totient is φ = 64744.

The previous prime is 161869. The next prime is 161873. The reversal of 161870 is 78161.

161870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8084 + ... + 8103.

It is an arithmetic number, because the mean of its divisors is an integer number (36423).

2¹⁶¹⁸⁷⁰ is an apocalyptic number.

161870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161870 is a deficient number, since it is larger than the sum of its proper divisors (129514).

161870 is a wasteful number, since it uses less digits than its factorization.

161870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16194.

The product of its (nonzero) digits is 336, while the sum is 23.

The square root of 161870 is about 402.3307097401. The cubic root of 161870 is about 54.4990320508.

The spelling of 161870 in words is "one hundred sixty-one thousand, eight hundred seventy".