8420810409 has 16 divisors (see below), whose sum is σ = 13609391040. Its totient is φ = 5103521280.

The previous prime is 8420810399. The next prime is 8420810467. The reversal of 8420810409 is 9040180248.

It is not a de Polignac number, because 8420810409 - 2²¹ = 8418713257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8420810479) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14176152 + ... + 14176745.

It is an arithmetic number, because the mean of its divisors is an integer number (850586940).

Almost surely, 2^8420810409 is an apocalyptic number.

It is an amenable number.

8420810409 is a deficient number, since it is larger than the sum of its proper divisors (5188580631).

8420810409 is a wasteful number, since it uses less digits than its factorization.

8420810409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28352917 (or 28352911 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 8420810409 is about 91764.9737590547. The cubic root of 8420810409 is about 2034.4700295561.

The spelling of 8420810409 in words is "eight billion, four hundred twenty million, eight hundred ten thousand, four hundred nine".