8420219409 has 32 divisors (see below), whose sum is σ = 13083992064. Its totient is φ = 4717540800.

The previous prime is 8420219399. The next prime is 8420219413. The reversal of 8420219409 is 9049120248.

It is not a de Polignac number, because 8420219409 - 2⁵ = 8420219377 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (8420219449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 199192 + ... + 237734.

It is an arithmetic number, because the mean of its divisors is an integer number (408874752).

Almost surely, 2^8420219409 is an apocalyptic number.

It is an amenable number.

8420219409 is a deficient number, since it is larger than the sum of its proper divisors (4663772655).

8420219409 is a wasteful number, since it uses less digits than its factorization.

8420219409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38757.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 8420219409 is about 91761.7535196446. The cubic root of 8420219409 is about 2034.4224331903.

The spelling of 8420219409 in words is "eight billion, four hundred twenty million, two hundred nineteen thousand, four hundred nine".