6421985 has 8 divisors (see below), whose sum is σ = 7753536. Its totient is φ = 5106160.

The previous prime is 6421967. The next prime is 6421997. The reversal of 6421985 is 5891246.

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

It is not a de Polignac number, because 6421985 - 2⁸ = 6421729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3011 + ... + 4680.

It is an arithmetic number, because the mean of its divisors is an integer number (969192).

Almost surely, 2^6421985 is an apocalyptic number.

It is an amenable number.

6421985 is a deficient number, since it is larger than the sum of its proper divisors (1331551).

6421985 is a wasteful number, since it uses less digits than its factorization.

6421985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7863.

The product of its digits is 17280, while the sum is 35.

The square root of 6421985 is about 2534.1635700957. The cubic root of 6421985 is about 185.8759048149.

The spelling of 6421985 in words is "six million, four hundred twenty-one thousand, nine hundred eighty-five".