189865943 has 8 divisors (see below), whose sum is σ = 199270368. Its totient is φ = 180557344.

The previous prime is 189865939. The next prime is 189865969. The reversal of 189865943 is 349568981.

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

It is a cyclic number.

It is not a de Polignac number, because 189865943 - 2² = 189865939 is a prime.

It is a super-2 number, since 2×189865943² = 72098152622558498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189861943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19880 + ... + 27837.

It is an arithmetic number, because the mean of its divisors is an integer number (24908796).

Almost surely, 2^189865943 is an apocalyptic number.

189865943 is a deficient number, since it is larger than the sum of its proper divisors (9404425).

189865943 is a wasteful number, since it uses less digits than its factorization.

189865943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47913.

The product of its digits is 1866240, while the sum is 53.

The square root of 189865943 is about 13779.1851355586. The cubic root of 189865943 is about 574.7544690837.

The spelling of 189865943 in words is "one hundred eighty-nine million, eight hundred sixty-five thousand, nine hundred forty-three".