6781943 has 6 divisors (see below), whose sum is σ = 7889256. Its totient is φ = 5813052.

The previous prime is 6781939. The next prime is 6781961. The reversal of 6781943 is 3491876.

It is not a de Polignac number, because 6781943 - 2² = 6781939 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6781897 and 6781906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6781543) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69155 + ... + 69252.

It is an arithmetic number, because the mean of its divisors is an integer number (1314876).

Almost surely, 2^6781943 is an apocalyptic number.

6781943 is a deficient number, since it is larger than the sum of its proper divisors (1107313).

6781943 is a wasteful number, since it uses less digits than its factorization.

6781943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138421 (or 138414 counting only the distinct ones).

The product of its digits is 36288, while the sum is 38.

The square root of 6781943 is about 2604.2163888587. The cubic root of 6781943 is about 189.2858044449.

The spelling of 6781943 in words is "six million, seven hundred eighty-one thousand, nine hundred forty-three".