6421075 has 12 divisors (see below), whose sum is σ = 8044128. Its totient is φ = 5084000.

The previous prime is 6421073. The next prime is 6421099. The reversal of 6421075 is 5701246.

It is not a de Polignac number, because 6421075 - 2¹ = 6421073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1254 + ... + 3796.

It is an arithmetic number, because the mean of its divisors is an integer number (670344).

Almost surely, 2^6421075 is an apocalyptic number.

6421075 is a deficient number, since it is larger than the sum of its proper divisors (1623053).

6421075 is a wasteful number, since it uses less digits than its factorization.

6421075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2654 (or 2649 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 6421075 is about 2533.9840173134. The cubic root of 6421075 is about 185.8671248160.

The spelling of 6421075 in words is "six million, four hundred twenty-one thousand, seventy-five".