1309371648 has 144 divisors (see below), whose sum is σ = 3773878080. Its totient is φ = 400637952.

The previous prime is 1309371647. The next prime is 1309371653. The reversal of 1309371648 is 8461739031.

It is a super-2 number, since 2×1309371648² = 3428908225172471808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309371641) 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, 3124783 + ... + 3125201.

Almost surely, 2^1309371648 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 1309371648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1886939040).

1309371648 is an abundant number, since it is smaller than the sum of its proper divisors (2464506432).

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

1309371648 is a wasteful number, since it uses less digits than its factorization.

1309371648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 750 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 1309371648 is about 36185.2407481282. The cubic root of 1309371648 is about 1094.0092086473.

The spelling of 1309371648 in words is "one billion, three hundred nine million, three hundred seventy-one thousand, six hundred forty-eight".