6393881 has 4 divisors (see below), whose sum is σ = 6885732. Its totient is φ = 5902032.

The previous prime is 6393869. The next prime is 6393911. The reversal of 6393881 is 1883936.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3534400 + 2859481 = 1880^2 + 1691^2 .

It is a cyclic number.

It is not a de Polignac number, because 6393881 - 2⁶ = 6393817 is a prime.

It is a super-2 number, since 2×6393881² = 81763428484322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (6393811) 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, 245906 + ... + 245931.

It is an arithmetic number, because the mean of its divisors is an integer number (1721433).

Almost surely, 2^6393881 is an apocalyptic number.

It is an amenable number.

6393881 is a deficient number, since it is larger than the sum of its proper divisors (491851).

6393881 is a wasteful number, since it uses less digits than its factorization.

6393881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491850.

The product of its digits is 31104, while the sum is 38.

The square root of 6393881 is about 2528.6124653651. The cubic root of 6393881 is about 185.6043638893.

The spelling of 6393881 in words is "six million, three hundred ninety-three thousand, eight hundred eighty-one".