8420975 has 12 divisors (see below), whose sum is σ = 10509744. Its totient is φ = 6693120.

The previous prime is 8420969. The next prime is 8420977. The reversal of 8420975 is 5790248.

It is a happy number.

It is not a de Polignac number, because 8420975 - 2⁴ = 8420959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420977) 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, 3167 + ... + 5183.

It is an arithmetic number, because the mean of its divisors is an integer number (875812).

Almost surely, 2^8420975 is an apocalyptic number.

8420975 is a deficient number, since it is larger than the sum of its proper divisors (2088769).

8420975 is a wasteful number, since it uses less digits than its factorization.

8420975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194 (or 2189 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 8420975 is about 2901.8916244409. The cubic root of 8420975 is about 203.4483284546.

The spelling of 8420975 in words is "eight million, four hundred twenty thousand, nine hundred seventy-five".