1289727140 has 48 divisors (see below), whose sum is σ = 2953735680. Its totient is φ = 470171520.

The previous prime is 1289727137. The next prime is 1289727143. The reversal of 1289727140 is 417279821.

It is an interprime number because it is at equal distance from previous prime (1289727137) and next prime (1289727143).

It is not an unprimeable number, because it can be changed into a prime (1289727143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10856 + ... + 51935.

It is an arithmetic number, because the mean of its divisors is an integer number (61536160).

Almost surely, 2^1289727140 is an apocalyptic number.

1289727140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289727140 is an abundant number, since it is smaller than the sum of its proper divisors (1664008540).

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

1289727140 is a wasteful number, since it uses less digits than its factorization.

1289727140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62892 (or 62890 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 1289727140 is about 35912.7712659438. The cubic root of 1289727140 is about 1088.5104756086.

The spelling of 1289727140 in words is "one billion, two hundred eighty-nine million, seven hundred twenty-seven thousand, one hundred forty".