821384075 has 12 divisors (see below), whose sum is σ = 1022149608. Its totient is φ = 654763200.

The previous prime is 821384063. The next prime is 821384077. The reversal of 821384075 is 570483128.

It is not a de Polignac number, because 821384075 - 2⁴ = 821384059 is a prime.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (821384077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51437 + ... + 65486.

It is an arithmetic number, because the mean of its divisors is an integer number (85179134).

Almost surely, 2^821384075 is an apocalyptic number.

821384075 is a deficient number, since it is larger than the sum of its proper divisors (200765533).

821384075 is a wasteful number, since it uses less digits than its factorization.

821384075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117214 (or 117209 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 821384075 is about 28659.7989350937. The cubic root of 821384075 is about 936.5164844229.

The spelling of 821384075 in words is "eight hundred twenty-one million, three hundred eighty-four thousand, seventy-five".