821465347 has 4 divisors (see below), whose sum is σ = 869786856. Its totient is φ = 773143840.

The previous prime is 821465297. The next prime is 821465353. The reversal of 821465347 is 743564128.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 821465347 - 2¹¹ = 821463299 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821465357) 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, 24160729 + ... + 24160762.

It is an arithmetic number, because the mean of its divisors is an integer number (217446714).

Almost surely, 2^821465347 is an apocalyptic number.

821465347 is a deficient number, since it is larger than the sum of its proper divisors (48321509).

821465347 is a wasteful number, since it uses less digits than its factorization.

821465347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48321508.

The product of its digits is 161280, while the sum is 40.

The square root of 821465347 is about 28661.2167745893. The cubic root of 821465347 is about 936.5473713368.

The spelling of 821465347 in words is "eight hundred twenty-one million, four hundred sixty-five thousand, three hundred forty-seven".