6781393 has 4 divisors (see below), whose sum is σ = 6830320. Its totient is φ = 6732468.

The previous prime is 6781391. The next prime is 6781399. The reversal of 6781393 is 3931876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6781393 - 2¹ = 6781391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6781391) 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, 24255 + ... + 24532.

It is an arithmetic number, because the mean of its divisors is an integer number (1707580).

Almost surely, 2^6781393 is an apocalyptic number.

It is an amenable number.

6781393 is a deficient number, since it is larger than the sum of its proper divisors (48927).

6781393 is a wasteful number, since it uses less digits than its factorization.

6781393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48926.

The product of its digits is 27216, while the sum is 37.

The square root of 6781393 is about 2604.1107887338. The cubic root of 6781393 is about 189.2806874252.

The spelling of 6781393 in words is "six million, seven hundred eighty-one thousand, three hundred ninety-three".