8436338621 has 4 divisors (see below), whose sum is σ = 8932593852. Its totient is φ = 7940083392.

The previous prime is 8436338609. The next prime is 8436338629. The reversal of 8436338621 is 1268336348.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6369636100 + 2066702521 = 79810^2 + 45461^2 .

It is a cyclic number.

It is not a de Polignac number, because 8436338621 - 2¹⁸ = 8436076477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8436338629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248127590 + ... + 248127623.

It is an arithmetic number, because the mean of its divisors is an integer number (2233148463).

Almost surely, 2^8436338621 is an apocalyptic number.

It is an amenable number.

8436338621 is a deficient number, since it is larger than the sum of its proper divisors (496255231).

8436338621 is a wasteful number, since it uses less digits than its factorization.

8436338621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496255230.

The product of its digits is 497664, while the sum is 44.

The square root of 8436338621 is about 91849.5433902641. The cubic root of 8436338621 is about 2035.7198017123.

The spelling of 8436338621 in words is "eight billion, four hundred thirty-six million, three hundred thirty-eight thousand, six hundred twenty-one".