1285855860 has 48 divisors (see below), whose sum is σ = 3812187456. Its totient is φ = 322724352.

The previous prime is 1285855849. The next prime is 1285855897. The reversal of 1285855860 is 685585821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 629302 + ... + 631341.

It is an arithmetic number, because the mean of its divisors is an integer number (79420572).

Almost surely, 2^1285855860 is an apocalyptic number.

1285855860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285855860 is an abundant number, since it is smaller than the sum of its proper divisors (2526331596).

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

1285855860 is a wasteful number, since it uses less digits than its factorization.

1285855860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260672 (or 1260670 counting only the distinct ones).

The product of its (nonzero) digits is 768000, while the sum is 48.

The square root of 1285855860 is about 35858.8323847835. The cubic root of 1285855860 is about 1087.4202832305.

The spelling of 1285855860 in words is "one billion, two hundred eighty-five million, eight hundred fifty-five thousand, eight hundred sixty".