921808453284 has 36 divisors (see below), whose sum is σ = 2330178418204. Its totient is φ = 307262693952.

The previous prime is 921808453273. The next prime is 921808453301. The reversal of 921808453284 is 482354808129.

921808453284 is a `hidden beast` number, since 9 + 2 + 180 + 8 + 453 + 2 + 8 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 246006080100 + 675802373184 = 495990^2 + 822072^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 921808453284.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1527354 + ... + 2043630.

Almost surely, 2^921808453284 is an apocalyptic number.

It is an amenable number.

921808453284 is an abundant number, since it is smaller than the sum of its proper divisors (1408369964920).

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

921808453284 is a wasteful number, since it uses less digits than its factorization.

921808453284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565884 (or 565879 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 921808453284 in words is "nine hundred twenty-one billion, eight hundred eight million, four hundred fifty-three thousand, two hundred eighty-four".