1309347860 has 48 divisors (see below), whose sum is σ = 2833468176. Its totient is φ = 507866112.

The previous prime is 1309347857. The next prime is 1309347889. The reversal of 1309347860 is 687439031.

It can be written as a sum of positive squares in 8 ways, for example, as 2669956 + 1306677904 = 1634^2 + 36148^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 228794 + ... + 234446.

It is an arithmetic number, because the mean of its divisors is an integer number (59030587).

Almost surely, 2^1309347860 is an apocalyptic number.

1309347860 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 1309347860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1416734088).

1309347860 is an abundant number, since it is smaller than the sum of its proper divisors (1524120316).

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

1309347860 is a wasteful number, since it uses less digits than its factorization.

1309347860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6012 (or 6010 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 1309347860 is about 36184.9120490848. The cubic root of 1309347860 is about 1094.0025834723.

The spelling of 1309347860 in words is "one billion, three hundred nine million, three hundred forty-seven thousand, eight hundred sixty".