821961376 has 12 divisors (see below), whose sum is σ = 1618236522. Its totient is φ = 410980672.

The previous prime is 821961359. The next prime is 821961389. The reversal of 821961376 is 673169128.

It can be written as a sum of positive squares in only one way, i.e., 777071376 + 44890000 = 27876^2 + 6700^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12843115 + ... + 12843178.

Almost surely, 2^821961376 is an apocalyptic number.

It is an amenable number.

821961376 is a deficient number, since it is larger than the sum of its proper divisors (796275146).

821961376 is a wasteful number, since it uses less digits than its factorization.

821961376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25686303 (or 25686295 counting only the distinct ones).

The product of its digits is 108864, while the sum is 43.

The square root of 821961376 is about 28669.8687823994. The cubic root of 821961376 is about 936.7358399007.

It can be divided in two parts, 8219613 and 76, that added together give a square (8219689 = 2867²).

The spelling of 821961376 in words is "eight hundred twenty-one million, nine hundred sixty-one thousand, three hundred seventy-six".