1306387740 has 192 divisors, whose sum is σ = 4342947840. Its totient is φ = 287124480.

The previous prime is 1306387723. The next prime is 1306387783. The reversal of 1306387740 is 477836031.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3502194 + ... + 3502566.

It is an arithmetic number, because the mean of its divisors is an integer number (22619520).

Almost surely, 2^1306387740 is an apocalyptic number.

1306387740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1306387740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171473920).

1306387740 is an abundant number, since it is smaller than the sum of its proper divisors (3036560100).

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

1306387740 is a wasteful number, since it uses less digits than its factorization.

1306387740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 39.

The square root of 1306387740 is about 36143.9862217769. The cubic root of 1306387740 is about 1093.1775360081.

The spelling of 1306387740 in words is "one billion, three hundred six million, three hundred eighty-seven thousand, seven hundred forty".