189798 has 16 divisors (see below), whose sum is σ = 433920. Its totient is φ = 54216.

The previous prime is 189797. The next prime is 189799. The reversal of 189798 is 897981.

It is an interprime number because it is at equal distance from previous prime (189797) and next prime (189799).

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 4519 = 189798 / (1 + 8 + 9 + 7 + 9 + 8).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2218 + ... + 2301.

It is an arithmetic number, because the mean of its divisors is an integer number (27120).

2¹⁸⁹⁷⁹⁸ is an apocalyptic number.

189798 is an abundant number, since it is smaller than the sum of its proper divisors (244122).

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

189798 is a wasteful number, since it uses less digits than its factorization.

189798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4531.

The product of its digits is 36288, while the sum is 42.

The square root of 189798 is about 435.6581228440. The cubic root of 189798 is about 57.4685902808.

The spelling of 189798 in words is "one hundred eighty-nine thousand, seven hundred ninety-eight".