1285671812 has 12 divisors (see below), whose sum is σ = 2252705616. Its totient is φ = 642041640.

The previous prime is 1285671787. The next prime is 1285671847. The reversal of 1285671812 is 2181765821.

It is a self number, because there is not a number n which added to its sum of digits gives 1285671812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194918 + ... + 201405.

It is an arithmetic number, because the mean of its divisors is an integer number (187725468).

Almost surely, 2^1285671812 is an apocalyptic number.

It is an amenable number.

1285671812 is a deficient number, since it is larger than the sum of its proper divisors (967033804).

1285671812 is a wasteful number, since it uses less digits than its factorization.

1285671812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397138 (or 397136 counting only the distinct ones).

The product of its digits is 53760, while the sum is 41.

The square root of 1285671812 is about 35856.2660074916. The cubic root of 1285671812 is about 1087.3683989606.

The spelling of 1285671812 in words is "one billion, two hundred eighty-five million, six hundred seventy-one thousand, eight hundred twelve".