3943686143 has 4 divisors (see below), whose sum is σ = 3944965920. Its totient is φ = 3942406368.

The previous prime is 3943686139. The next prime is 3943686161. The reversal of 3943686143 is 3416863493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3416863493 = 31 ⋅110221403.

It is a cyclic number.

It is not a de Polignac number, because 3943686143 - 2² = 3943686139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3943286143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 635255 + ... + 641432.

It is an arithmetic number, because the mean of its divisors is an integer number (986241480).

Almost surely, 2^3943686143 is an apocalyptic number.

3943686143 is a deficient number, since it is larger than the sum of its proper divisors (1279777).

3943686143 is a wasteful number, since it uses less digits than its factorization.

3943686143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279776.

The product of its digits is 1119744, while the sum is 47.

The square root of 3943686143 is about 62798.7750119379. The cubic root of 3943686143 is about 1579.9164276418.

The spelling of 3943686143 in words is "three billion, nine hundred forty-three million, six hundred eighty-six thousand, one hundred forty-three".