821440852 has 24 divisors (see below), whose sum is σ = 1511903232. Its totient is φ = 389968800.

The previous prime is 821440847. The next prime is 821440861. The reversal of 821440852 is 258044128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55924 + ... + 69067.

It is an arithmetic number, because the mean of its divisors is an integer number (62995968).

Almost surely, 2^821440852 is an apocalyptic number.

It is an amenable number.

821440852 is a deficient number, since it is larger than the sum of its proper divisors (690462380).

821440852 is a wasteful number, since it uses less digits than its factorization.

821440852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125079 (or 125077 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 34.

The square root of 821440852 is about 28660.7894517928. The cubic root of 821440852 is about 936.5380623801.

The spelling of 821440852 in words is "eight hundred twenty-one million, four hundred forty thousand, eight hundred fifty-two".