891393043492 has 24 divisors (see below), whose sum is σ = 1820717708544. Its totient is φ = 373897385472.

The previous prime is 891393043483. The next prime is 891393043511. The reversal of 891393043492 is 294340393198.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338673853 + ... + 338676484.

It is an arithmetic number, because the mean of its divisors is an integer number (75863237856).

Almost surely, 2^891393043492 is an apocalyptic number.

It is an amenable number.

891393043492 is an abundant number, since it is smaller than the sum of its proper divisors (929324665052).

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

891393043492 is a wasteful number, since it uses less digits than its factorization.

891393043492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677350395 (or 677350393 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 55.

The spelling of 891393043492 in words is "eight hundred ninety-one billion, three hundred ninety-three million, forty-three thousand, four hundred ninety-two".