853808399 has 8 divisors (see below), whose sum is σ = 869646720. Its totient is φ = 838029600.

The previous prime is 853808393. The next prime is 853808443. The reversal of 853808399 is 993808358.

It is a happy number.

It is a Cunningham number, because it is equal to 29220²-1.

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 853808399 - 2⁴ = 853808383 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 853808399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (853808393) 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, 14609 + ... + 43829.

It is an arithmetic number, because the mean of its divisors is an integer number (108705840).

Almost surely, 2^853808399 is an apocalyptic number.

853808399 is a deficient number, since it is larger than the sum of its proper divisors (15838321).

853808399 is a wasteful number, since it uses less digits than its factorization.

853808399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29761.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 853808399 is about 29219.9999828884. Note that the first 4 decimals coincide. The cubic root of 853808399 is about 948.6808649904.

The spelling of 853808399 in words is "eight hundred fifty-three million, eight hundred eight thousand, three hundred ninety-nine".