6781394 has 4 divisors (see below), whose sum is σ = 10172094. Its totient is φ = 3390696.

The previous prime is 6781391. The next prime is 6781399. The reversal of 6781394 is 4931876.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6375625 + 405769 = 2525^2 + 637^2 .

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 as a sum of consecutive naturals, namely, 1695347 + ... + 1695350.

Almost surely, 2^6781394 is an apocalyptic number.

6781394 is a deficient number, since it is larger than the sum of its proper divisors (3390700).

6781394 is a wasteful number, since it uses less digits than its factorization.

6781394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3390699.

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

The square root of 6781394 is about 2604.1109807380. The cubic root of 6781394 is about 189.2806967291.

The spelling of 6781394 in words is "six million, seven hundred eighty-one thousand, three hundred ninety-four".