821459868 has 24 divisors (see below), whose sum is σ = 1921021200. Its totient is φ = 273208320.

The previous prime is 821459833. The next prime is 821459909. The reversal of 821459868 is 868954128.

It is a self number, because there is not a number n which added to its sum of digits gives 821459868.

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, 70843 + ... + 81618.

It is an arithmetic number, because the mean of its divisors is an integer number (80042550).

Almost surely, 2^821459868 is an apocalyptic number.

It is an amenable number.

821459868 is an abundant number, since it is smaller than the sum of its proper divisors (1099561332).

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

821459868 is a wasteful number, since it uses less digits than its factorization.

821459868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152917 (or 152915 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 51.

The square root of 821459868 is about 28661.1211923051. The cubic root of 821459868 is about 936.5452891412.

The spelling of 821459868 in words is "eight hundred twenty-one million, four hundred fifty-nine thousand, eight hundred sixty-eight".