189940 has 12 divisors (see below), whose sum is σ = 398916. Its totient is φ = 75968.

The previous prime is 189929. The next prime is 189947. The reversal of 189940 is 49981.

189940 is nontrivially palindromic in base 6.

It can be written as a sum of positive squares in 2 ways, for example, as 33124 + 156816 = 182^2 + 396^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4729 + ... + 4768.

It is an arithmetic number, because the mean of its divisors is an integer number (33243).

2¹⁸⁹⁹⁴⁰ is an apocalyptic number.

189940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

189940 is an abundant number, since it is smaller than the sum of its proper divisors (208976).

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

189940 is a wasteful number, since it uses less digits than its factorization.

189940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9506 (or 9504 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 189940 is about 435.8210641995. The cubic root of 189940 is about 57.4829186817.

The spelling of 189940 in words is "one hundred eighty-nine thousand, nine hundred forty".