161898 has 24 divisors (see below), whose sum is σ = 357504. Its totient is φ = 48840.

The previous prime is 161881. The next prime is 161911. The reversal of 161898 is 898161.

161898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (33).

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 615 + ... + 837.

It is an arithmetic number, because the mean of its divisors is an integer number (14896).

2¹⁶¹⁸⁹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161898, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (178752).

161898 is an abundant number, since it is smaller than the sum of its proper divisors (195606).

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

161898 is a wasteful number, since it uses less digits than its factorization.

161898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250 (or 239 counting only the distinct ones).

The product of its digits is 3456, while the sum is 33.

The square root of 161898 is about 402.3655054798. The cubic root of 161898 is about 54.5021742532.

The spelling of 161898 in words is "one hundred sixty-one thousand, eight hundred ninety-eight".