1285827856 has 40 divisors (see below), whose sum is σ = 2534837760. Its totient is φ = 631766784.

The previous prime is 1285827847. The next prime is 1285827877. The reversal of 1285827856 is 6587285821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235105 + ... + 240511.

It is an arithmetic number, because the mean of its divisors is an integer number (63370944).

Almost surely, 2^1285827856 is an apocalyptic number.

1285827856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1285827856 is a deficient number, since it is larger than the sum of its proper divisors (1249009904).

1285827856 is a wasteful number, since it uses less digits than its factorization.

1285827856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5671 (or 5665 counting only the distinct ones).

The product of its digits is 2150400, while the sum is 52.

The square root of 1285827856 is about 35858.4419070322. The cubic root of 1285827856 is about 1087.4123890490.

The spelling of 1285827856 in words is "one billion, two hundred eighty-five million, eight hundred twenty-seven thousand, eight hundred fifty-six".