1286640912 has 80 divisors (see below), whose sum is σ = 3454064640. Its totient is φ = 412210176.

The previous prime is 1286640911. The next prime is 1286640931. The reversal of 1286640912 is 2190466821.

It is not an unprimeable number, because it can be changed into a prime (1286640911) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 322353 + ... + 326319.

It is an arithmetic number, because the mean of its divisors is an integer number (43175808).

Almost surely, 2^1286640912 is an apocalyptic number.

1286640912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286640912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1727032320).

1286640912 is an abundant number, since it is smaller than the sum of its proper divisors (2167423728).

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

1286640912 is a wasteful number, since it uses less digits than its factorization.

1286640912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240 (or 4234 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1286640912 is about 35869.7771389787. Note that the first 3 decimals coincide. The cubic root of 1286640912 is about 1087.6415386660.

The spelling of 1286640912 in words is "one billion, two hundred eighty-six million, six hundred forty thousand, nine hundred twelve".