823398385 has 4 divisors (see below), whose sum is σ = 988078068. Its totient is φ = 658718704.

The previous prime is 823398361. The next prime is 823398397. The reversal of 823398385 is 583893328.

It is a happy number.

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 570206641 + 253191744 = 23879^2 + 15912^2 .

It is a cyclic number.

It is not a de Polignac number, because 823398385 - 2⁵ = 823398353 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82339834 + ... + 82339843.

It is an arithmetic number, because the mean of its divisors is an integer number (247019517).

Almost surely, 2^823398385 is an apocalyptic number.

It is an amenable number.

823398385 is a deficient number, since it is larger than the sum of its proper divisors (164679683).

823398385 is a wasteful number, since it uses less digits than its factorization.

823398385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164679682.

The product of its digits is 1244160, while the sum is 49.

The square root of 823398385 is about 28694.9191495637. The cubic root of 823398385 is about 937.2814106076.

The spelling of 823398385 in words is "eight hundred twenty-three million, three hundred ninety-eight thousand, three hundred eighty-five".