6393904 has 40 divisors (see below), whose sum is σ = 14316048. Its totient is φ = 2734080.

The previous prime is 6393869. The next prime is 6393911. The reversal of 6393904 is 4093936.

It is a super-2 number, since 2×6393904² = 81764016722432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a d-powerful number, because it can be written as 6³ + 3 + 9 + 3¹³ + 9⁷ + 0 + 4⁷ .

It is a self number, because there is not a number n which added to its sum of digits gives 6393904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1924 + ... + 4060.

Almost surely, 2^6393904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6393904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7158024).

6393904 is an abundant number, since it is smaller than the sum of its proper divisors (7922144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6393904 is a wasteful number, since it uses less digits than its factorization.

6393904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2173 (or 2167 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 34.

The square root of 6393904 is about 2528.6170133098. The cubic root of 6393904 is about 185.6045864404.

Subtracting from 6393904 its reverse (4093936), we obtain a cube (2299968 = 132³).

The spelling of 6393904 in words is "six million, three hundred ninety-three thousand, nine hundred four".