1285142886 has 12 divisors (see below), whose sum is σ = 2784476292. Its totient is φ = 428380956.

The previous prime is 1285142861. The next prime is 1285142891. The reversal of 1285142886 is 6882415821.

1285142886 is a `hidden beast` number, since 128 + 514 + 2 + 8 + 8 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35698396 + ... + 35698431.

It is an arithmetic number, because the mean of its divisors is an integer number (232039691).

Almost surely, 2^1285142886 is an apocalyptic number.

1285142886 is an abundant number, since it is smaller than the sum of its proper divisors (1499333406).

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

1285142886 is a wasteful number, since it uses less digits than its factorization.

1285142886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71396835 (or 71396832 counting only the distinct ones).

The product of its digits is 245760, while the sum is 45.

The square root of 1285142886 is about 35848.8896062347. The cubic root of 1285142886 is about 1087.2192638803.

The spelling of 1285142886 in words is "one billion, two hundred eighty-five million, one hundred forty-two thousand, eight hundred eighty-six".