821883408 has 40 divisors (see below), whose sum is σ = 2191693056. Its totient is φ = 265123200.

The previous prime is 821883397. The next prime is 821883443. The reversal of 821883408 is 804388128.

It is a self number, because there is not a number n which added to its sum of digits gives 821883408.

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, 274683 + ... + 277658.

Almost surely, 2^821883408 is an apocalyptic number.

It is an amenable number.

821883408 is an abundant number, since it is smaller than the sum of its proper divisors (1369809648).

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

821883408 is a wasteful number, since it uses less digits than its factorization.

821883408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552383 (or 552377 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 821883408 is about 28668.5089950629. The cubic root of 821883408 is about 936.7062206138.

The spelling of 821883408 in words is "eight hundred twenty-one million, eight hundred eighty-three thousand, four hundred eight".