1285644812 has 6 divisors (see below), whose sum is σ = 2249878428. Its totient is φ = 642822404.

The previous prime is 1285644799. The next prime is 1285644821. The reversal of 1285644812 is 2184465821.

It is a self number, because there is not a number n which added to its sum of digits gives 1285644812.

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 as a sum of consecutive naturals, namely, 160705598 + ... + 160705605.

It is an arithmetic number, because the mean of its divisors is an integer number (374979738).

Almost surely, 2^1285644812 is an apocalyptic number.

It is an amenable number.

1285644812 is a deficient number, since it is larger than the sum of its proper divisors (964233616).

1285644812 is a wasteful number, since it uses less digits than its factorization.

1285644812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321411207 (or 321411205 counting only the distinct ones).

The product of its digits is 122880, while the sum is 41.

The square root of 1285644812 is about 35855.8895022840. The cubic root of 1285644812 is about 1087.3607870770.

The spelling of 1285644812 in words is "one billion, two hundred eighty-five million, six hundred forty-four thousand, eight hundred twelve".