8420185404 has 72 divisors (see below), whose sum is σ = 22001161728. Its totient is φ = 2712454560.

The previous prime is 8420185399. The next prime is 8420185427. The reversal of 8420185404 is 4045810248.

8420185404 is a `hidden beast` number, since 84 + 20 + 18 + 540 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 873499 + ... + 883085.

Almost surely, 2^8420185404 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8420185404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11000580864).

8420185404 is an abundant number, since it is smaller than the sum of its proper divisors (13580976324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8420185404 is a wasteful number, since it uses less digits than its factorization.

8420185404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10415 (or 10410 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 36.

The square root of 8420185404 is about 91761.5682298423. The cubic root of 8420185404 is about 2034.4196945195.

The spelling of 8420185404 in words is "eight billion, four hundred twenty million, one hundred eighty-five thousand, four hundred four".