1309489608 has 64 divisors (see below), whose sum is σ = 3751608960. Its totient is φ = 373118976.

The previous prime is 1309489547. The next prime is 1309489609. The reversal of 1309489608 is 8069849031.

It is not an unprimeable number, because it can be changed into a prime (1309489609) 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, 52216 + ... + 73112.

It is an arithmetic number, because the mean of its divisors is an integer number (58618890).

Almost surely, 2^1309489608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1309489608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1875804480).

1309489608 is an abundant number, since it is smaller than the sum of its proper divisors (2442119352).

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

1309489608 is a wasteful number, since it uses less digits than its factorization.

1309489608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21286 (or 21282 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 1309489608 is about 36186.8706577399. The cubic root of 1309489608 is about 1094.0420603975.

The spelling of 1309489608 in words is "one billion, three hundred nine million, four hundred eighty-nine thousand, six hundred eight".