189917 has 8 divisors (see below), whose sum is σ = 233856. Its totient is φ = 150192.

The previous prime is 189913. The next prime is 189929. The reversal of 189917 is 719981.

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

It is not a de Polignac number, because 189917 - 2² = 189913 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 189917.

It is not an unprimeable number, because it can be changed into a prime (189913) 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, 953 + ... + 1134.

It is an arithmetic number, because the mean of its divisors is an integer number (29232).

2¹⁸⁹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

189917 is a deficient number, since it is larger than the sum of its proper divisors (43939).

189917 is a wasteful number, since it uses less digits than its factorization.

189917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107.

The product of its digits is 4536, while the sum is 35.

The square root of 189917 is about 435.7946764246. The cubic root of 189917 is about 57.4805983692.

The spelling of 189917 in words is "one hundred eighty-nine thousand, nine hundred seventeen".