491886856 has 16 divisors (see below), whose sum is σ = 926150400. Its totient is φ = 244913424.

The previous prime is 491886841. The next prime is 491886869. The reversal of 491886856 is 658688194.

It is a junction number, because it is equal to n+sod(n) for n = 491886797 and 491886806.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126720 + ... + 130543.

It is an arithmetic number, because the mean of its divisors is an integer number (57884400).

Almost surely, 2^491886856 is an apocalyptic number.

It is an amenable number.

491886856 is a deficient number, since it is larger than the sum of its proper divisors (434263544).

491886856 is a wasteful number, since it uses less digits than its factorization.

491886856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257508 (or 257504 counting only the distinct ones).

The product of its digits is 3317760, while the sum is 55.

The square root of 491886856 is about 22178.5224034425. The cubic root of 491886856 is about 789.3841571231.

The spelling of 491886856 in words is "four hundred ninety-one million, eight hundred eighty-six thousand, eight hundred fifty-six".