8505821438 has 4 divisors (see below), whose sum is σ = 12758732160. Its totient is φ = 4252910718.

The previous prime is 8505821417. The next prime is 8505821461. The reversal of 8505821438 is 8341285058.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2126455358 + ... + 2126455361.

It is an arithmetic number, because the mean of its divisors is an integer number (3189683040).

Almost surely, 2^8505821438 is an apocalyptic number.

8505821438 is a deficient number, since it is larger than the sum of its proper divisors (4252910722).

8505821438 is a wasteful number, since it uses less digits than its factorization.

8505821438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4252910721.

The product of its (nonzero) digits is 307200, while the sum is 44.

The square root of 8505821438 is about 92227.0103494632. The cubic root of 8505821438 is about 2041.2933486001.

The spelling of 8505821438 in words is "eight billion, five hundred five million, eight hundred twenty-one thousand, four hundred thirty-eight".