823340309 has 4 divisors (see below), whose sum is σ = 898189440. Its totient is φ = 748491180.

The previous prime is 823340303. The next prime is 823340327. The reversal of 823340309 is 903043328.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 823340309 - 2¹⁶ = 823274773 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 (823340303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37424549 + ... + 37424570.

It is an arithmetic number, because the mean of its divisors is an integer number (224547360).

Almost surely, 2^823340309 is an apocalyptic number.

It is an amenable number.

823340309 is a deficient number, since it is larger than the sum of its proper divisors (74849131).

823340309 is a wasteful number, since it uses less digits than its factorization.

823340309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74849130.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 823340309 is about 28693.9071755660. The cubic root of 823340309 is about 937.2593739540.

The spelling of 823340309 in words is "eight hundred twenty-three million, three hundred forty thousand, three hundred nine".