809638399 has 8 divisors (see below), whose sum is σ = 813745152. Its totient is φ = 805539960.

The previous prime is 809638397. The next prime is 809638411. The reversal of 809638399 is 993836908.

809638399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 809638399 - 2¹ = 809638397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809638391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288694 + ... + 291484.

It is an arithmetic number, because the mean of its divisors is an integer number (101718144).

Almost surely, 2^809638399 is an apocalyptic number.

809638399 is a deficient number, since it is larger than the sum of its proper divisors (4106753).

809638399 is a wasteful number, since it uses less digits than its factorization.

809638399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4157.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 809638399 is about 28454.1455503412. The cubic root of 809638399 is about 932.0310177591.

The spelling of 809638399 in words is "eight hundred nine million, six hundred thirty-eight thousand, three hundred ninety-nine".