163839943 has 4 divisors (see below), whose sum is σ = 165289968. Its totient is φ = 162389920.

The previous prime is 163839941. The next prime is 163839967. The reversal of 163839943 is 349938361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 349938361 = 647 ⋅540863.

It is a cyclic number.

It is not a de Polignac number, because 163839943 - 2¹ = 163839941 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163839893 and 163839902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163839941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 724843 + ... + 725068.

It is an arithmetic number, because the mean of its divisors is an integer number (41322492).

Almost surely, 2^163839943 is an apocalyptic number.

163839943 is a deficient number, since it is larger than the sum of its proper divisors (1450025).

163839943 is a wasteful number, since it uses less digits than its factorization.

163839943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1450024.

The product of its digits is 419904, while the sum is 46.

The square root of 163839943 is about 12799.9977734373. The cubic root of 163839943 is about 547.1922394804.

The spelling of 163839943 in words is "one hundred sixty-three million, eight hundred thirty-nine thousand, nine hundred forty-three".