1289303427440 has 80 divisors (see below), whose sum is σ = 3426343741632. Its totient is φ = 441984909312.

The previous prime is 1289303427431. The next prime is 1289303427443. The reversal of 1289303427440 is 447243039821.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289303427443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3928562 + ... + 4244078.

Almost surely, 2^{1289303427440} is an apocalyptic number.

1289303427440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1289303427440 is an abundant number, since it is smaller than the sum of its proper divisors (2137040314192).

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

1289303427440 is a wasteful number, since it uses less digits than its factorization.

1289303427440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322834 (or 322828 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 47.

The spelling of 1289303427440 in words is "one trillion, two hundred eighty-nine billion, three hundred three million, four hundred twenty-seven thousand, four hundred forty".