823921308 has 120 divisors (see below), whose sum is σ = 2486195712. Its totient is φ = 233054496.

The previous prime is 823921283. The next prime is 823921313. The reversal of 823921308 is 803129328.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 231841 + ... + 235367.

Almost surely, 2^823921308 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 823921308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1243097856).

823921308 is an abundant number, since it is smaller than the sum of its proper divisors (1662274404).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

823921308 is a wasteful number, since it uses less digits than its factorization.

823921308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3653 (or 3642 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 823921308 is about 28704.0294732290. The cubic root of 823921308 is about 937.4797845241.

The spelling of 823921308 in words is "eight hundred twenty-three million, nine hundred twenty-one thousand, three hundred eight".