821895240 has 64 divisors (see below), whose sum is σ = 2467598400. Its totient is φ = 219002112.

The previous prime is 821895227. The next prime is 821895241. The reversal of 821895240 is 42598128.

It is not an unprimeable number, because it can be changed into a prime (821895241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262806 + ... + 265914.

It is an arithmetic number, because the mean of its divisors is an integer number (38556225).

Almost surely, 2^821895240 is an apocalyptic number.

It is an amenable number.

821895240 is an abundant number, since it is smaller than the sum of its proper divisors (1645703160).

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

821895240 is a wasteful number, since it uses less digits than its factorization.

821895240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5326 (or 5322 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 821895240 is about 28668.7153531511. The cubic root of 821895240 is about 936.7107155964.

The spelling of 821895240 in words is "eight hundred twenty-one million, eight hundred ninety-five thousand, two hundred forty".