6404993 has 8 divisors (see below), whose sum is σ = 7337088. Its totient is φ = 5477184.

The previous prime is 6404987. The next prime is 6405011. The reversal of 6404993 is 3994046.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6404993 - 2⁶ = 6404929 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6403993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3380 + ... + 4922.

It is an arithmetic number, because the mean of its divisors is an integer number (917136).

Almost surely, 2^6404993 is an apocalyptic number.

It is an amenable number.

6404993 is a deficient number, since it is larger than the sum of its proper divisors (932095).

6404993 is a wasteful number, since it uses less digits than its factorization.

6404993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 6404993 is about 2530.8087640120. The cubic root of 6404993 is about 185.7118229879.

The spelling of 6404993 in words is "six million, four hundred four thousand, nine hundred ninety-three".