1309438872 has 160 divisors (see below), whose sum is σ = 4438415520. Its totient is φ = 352097280.

The previous prime is 1309438859. The next prime is 1309438873. The reversal of 1309438872 is 2788349031.

1309438872 is a `hidden beast` number, since 130 + 9 + 438 + 87 + 2 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1309438873) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 68622 + ... + 85602.

It is an arithmetic number, because the mean of its divisors is an integer number (27740097).

Almost surely, 2^1309438872 is an apocalyptic number.

1309438872 is a gapful number since it is divisible by the number (12) 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 1309438872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2219207760).

1309438872 is an abundant number, since it is smaller than the sum of its proper divisors (3128976648).

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

1309438872 is a wasteful number, since it uses less digits than its factorization.

1309438872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17023 (or 17010 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1309438872 is about 36186.1696232138. The cubic root of 1309438872 is about 1094.0279307105.

The spelling of 1309438872 in words is "one billion, three hundred nine million, four hundred thirty-eight thousand, eight hundred seventy-two".