189771 has 12 divisors (see below), whose sum is σ = 272376. Its totient is φ = 117120.

The previous prime is 189767. The next prime is 189797. The reversal of 189771 is 177981.

It is not a de Polignac number, because 189771 - 2² = 189767 is a prime.

It is an Ulam number.

189771 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (189701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3081 + ... + 3141.

It is an arithmetic number, because the mean of its divisors is an integer number (22698).

2¹⁸⁹⁷⁷¹ is an apocalyptic number.

189771 is a deficient number, since it is larger than the sum of its proper divisors (82605).

189771 is an equidigital number, since it uses as much as digits as its factorization.

189771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 81 counting only the distinct ones).

The product of its digits is 3528, while the sum is 33.

The square root of 189771 is about 435.6271341411. The cubic root of 189771 is about 57.4658650580.

The spelling of 189771 in words is "one hundred eighty-nine thousand, seven hundred seventy-one".