6394921 has 8 divisors (see below), whose sum is σ = 6951560. Its totient is φ = 5847552.

The previous prime is 6394909. The next prime is 6394933. The reversal of 6394921 is 1294936.

It is an interprime number because it is at equal distance from previous prime (6394909) and next prime (6394933).

It can be written as a sum of positive squares in 4 ways, for example, as 44521 + 6350400 = 211^2 + 2520^2 .

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 6394921 - 2¹⁷ = 6263849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6394981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840 + ... + 3673.

It is an arithmetic number, because the mean of its divisors is an integer number (868945).

Almost surely, 2^6394921 is an apocalyptic number.

It is an amenable number.

6394921 is a deficient number, since it is larger than the sum of its proper divisors (556639).

6394921 is a wasteful number, since it uses less digits than its factorization.

6394921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4635.

The product of its digits is 11664, while the sum is 34.

The square root of 6394921 is about 2528.8181033835. The cubic root of 6394921 is about 185.6144265348.

The spelling of 6394921 in words is "six million, three hundred ninety-four thousand, nine hundred twenty-one".