8419021 has 4 divisors (see below), whose sum is σ = 9066652. Its totient is φ = 7771392.

The previous prime is 8418979. The next prime is 8419039. The reversal of 8419021 is 1209148.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4862025 + 3556996 = 2205^2 + 1886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8419021 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 (8419121) 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 3 ways as a sum of consecutive naturals, for example, 323796 + ... + 323821.

It is an arithmetic number, because the mean of its divisors is an integer number (2266663).

Almost surely, 2^8419021 is an apocalyptic number.

It is an amenable number.

8419021 is a deficient number, since it is larger than the sum of its proper divisors (647631).

8419021 is a wasteful number, since it uses less digits than its factorization.

8419021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 647630.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 8419021 is about 2901.5549279653. The cubic root of 8419021 is about 203.4325912118.

The spelling of 8419021 in words is "eight million, four hundred nineteen thousand, twenty-one".