1286729988 has 24 divisors (see below), whose sum is σ = 3004078560. Its totient is φ = 428665920.

The previous prime is 1286729981. The next prime is 1286729999. The reversal of 1286729988 is 8899276821.

It is not an unprimeable number, because it can be changed into a prime (1286729981) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 7873 + ... + 51336.

It is an arithmetic number, because the mean of its divisors is an integer number (125169940).

Almost surely, 2^1286729988 is an apocalyptic number.

It is an amenable number.

1286729988 is an abundant number, since it is smaller than the sum of its proper divisors (1717348572).

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

1286729988 is a wasteful number, since it uses less digits than its factorization.

1286729988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61027 (or 61025 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 60.

The square root of 1286729988 is about 35871.0187756077. The cubic root of 1286729988 is about 1087.6666377492. Note that the first 4 decimals are identical.

The spelling of 1286729988 in words is "one billion, two hundred eighty-six million, seven hundred twenty-nine thousand, nine hundred eighty-eight".