821823397 has 8 divisors (see below), whose sum is σ = 866487200. Its totient is φ = 777300624.

The previous prime is 821823383. The next prime is 821823403. The reversal of 821823397 is 793328128.

821823397 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 821823397 - 2¹⁹ = 821299109 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 (821823307) 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, 23178 + ... + 46699.

It is an arithmetic number, because the mean of its divisors is an integer number (108310900).

Almost surely, 2^821823397 is an apocalyptic number.

It is an amenable number.

821823397 is a deficient number, since it is larger than the sum of its proper divisors (44663803).

821823397 is a wasteful number, since it uses less digits than its factorization.

821823397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70515.

The product of its digits is 145152, while the sum is 43.

The square root of 821823397 is about 28667.4623397328. The cubic root of 821823397 is about 936.6834217413.

The spelling of 821823397 in words is "eight hundred twenty-one million, eight hundred twenty-three thousand, three hundred ninety-seven".