8421819 has 8 divisors (see below), whose sum is σ = 12833280. Its totient is φ = 4812456.

The previous prime is 8421799. The next prime is 8421821. The reversal of 8421819 is 9181248.

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

It is not a de Polignac number, because 8421819 - 2⁸ = 8421563 is a prime.

It is a super-2 number, since 2×8421819² = 141854070537522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8421819.

It is not an unprimeable number, because it can be changed into a prime (8421839) 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, 200499 + ... + 200540.

It is an arithmetic number, because the mean of its divisors is an integer number (1604160).

Almost surely, 2^8421819 is an apocalyptic number.

8421819 is a deficient number, since it is larger than the sum of its proper divisors (4411461).

8421819 is a wasteful number, since it uses less digits than its factorization.

8421819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401049.

The product of its digits is 4608, while the sum is 33.

The square root of 8421819 is about 2902.0370431819. The cubic root of 8421819 is about 203.4551251598.

The spelling of 8421819 in words is "eight million, four hundred twenty-one thousand, eight hundred nineteen".