1309491488 has 18 divisors (see below), whose sum is σ = 2578464441. Its totient is φ = 654643392.

The previous prime is 1309491481. The next prime is 1309491517. The reversal of 1309491488 is 8841949031.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 769951504 + 539539984 = 27748^2 + 23228^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=25588.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1309491481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 201506 + ... + 207902.

Almost surely, 2^1309491488 is an apocalyptic number.

It is an amenable number.

1309491488 is a deficient number, since it is larger than the sum of its proper divisors (1268972953).

1309491488 is an frugal number, since it uses more digits than its factorization.

1309491488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804 (or 6399 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 47.

The square root of 1309491488 is about 36186.8966340028. The cubic root of 1309491488 is about 1094.0425839598.

The spelling of 1309491488 in words is "one billion, three hundred nine million, four hundred ninety-one thousand, four hundred eighty-eight".